In most of Andalusia the free tapa has quietly shrunk to a saucer of olives. In Granada it is still a plate of food, and it still arrives unasked with every drink you order: a wedge of tortilla, a heap of fried anchovies, potatoes stewed down with cuttlefish, a slice of roast ham with bread. Nobody asks you what you want. The bar decides, the plate lands, and the second round brings something different.

That one surviving custom changes the shape of an evening here. You do not pick a restaurant and settle into it for three hours. You pick a quarter, order a beer, eat what the kitchen has decided to send out, and then walk two streets and do it again. Which makes the useful question not where is the best restaurant in Granada, but which streets, in what order, and at what hour.

The city's eating quarters are small, walkable and unevenly good. One is loud, touristed and still worth an hour. One is where people who actually live here slow down. One has four bars, a hard climb and the light that makes the climb worth it. Here is how they fit together, and what to order once you are standing at the bar with a plate in your hand.

The free tapa, and the arithmetic of an evening

The working rule is one tapa per drink per person. Order two beers, two plates come. Order a second round in the same bar and you get a different plate, and in the better places the tapas escalate: something simple first, something the kitchen is prouder of on the third round. This is the single best argument for staying put for two drinks rather than one.

You generally do not choose. Some bars hand over a short list, most do not, and asking for a swap is fine but marks you immediately as a visitor. Tell them about an allergy or a hard no on offal when you order the drink, not when the plate arrives.

Stand at the bar if you can. In several places the terrace is table service with a surcharge and no free tapa, and the bar is where the tapas are generous and the turnover fast. If you actually want to eat a specific thing, order it as a ración or a media ración and pay for it. That is not cheating; locals do it constantly, and the free plates keep coming alongside.

The money is the reason people rave about this city. A caña or a glass of wine with its tapa usually lands somewhere around three euros, so four rounds across four bars is dinner for roughly twelve to fifteen euros a head, drinks included. Budget travellers should still carry cash for the older places.

Timing matters more than anything. Midday tapas run through the early afternoon, and the evening does not begin when you think it does: kitchens typically get moving around nine, and a bar that looked dead at eight will be three deep by ten. Many family bars close one weekday and most shut on Sunday evening, so build your best bar into a Tuesday-to-Friday slot rather than a Sunday.

Calle Navas: a loud first hour, not a whole night

Navas is the street everyone is sent to, a short pedestrian run near Plaza Mariana Pineda lined end to end with bars, and its reputation is deserved in the narrow sense that the concentration is extraordinary. It is also the most touristed tapas street in the city, and after about nine in the evening it is shoulder to shoulder.

Go, but treat it as a first hour rather than a destination. Bar Los Diamantes has been frying fish for Granadinos on Navas since 1942 and is the one fixed point: order a surtido de pescado, the mixed fry, and let the free plates do the rest. Their Russian salad has a following of its own. There is a larger, easier branch on Plaza Nueva if Navas is impassable.

A couple of minutes away, La Riviera deals in seafood and is known for garlic prawns and for tapas that arrive closer to half-ración size than most. Two bars is the right dose. Skip anything on the street with photographs on the menu board or someone outside trying to talk you in, and move on before the crowd sets.

Plaza Nueva, Elvira and the Pescadería: fried fish and old barrels

The knot of lanes behind Plaza Nueva, running toward Calle Elvira, is where the old bars are, and it is a five-minute walk from Navas.

Casa Julio, tucked into a tiny alley off Elvira and trading since the 1940s, is the fried-fish specialist: boquerones fritos, rape en adobo, fried calamares, fried aubergine. The distinction here is a fry that comes out dry rather than oily, which is the whole craft of Andalusian pescaíto frito. The room is barely a room. Stand, eat, leave.

Bodegas Castañeda, on the Almireceros lane near Plaza Nueva, is the other institution: barrels, hanging hams, vermouth on tap and a wine list read off the wall. It keeps long hours through the middle of the day and late into the night, which makes it the reliable answer when everything else is between services. Order a tabla of cured meats and cheese if you want to sit properly.

A short walk toward the cathedral, Plaza Pescadería is where the seafood gets serious. Cunini takes delivery from the port of Motril on the Costa Tropical, about an hour away, and works two ways: stand at the bar and let the tapas come, or book the terrace and eat monkfish or red mullet properly, for which expect to pay somewhere in the region of twenty-five euros a head. Oliver, on the same square, is the fried-fish counterpart.

For the Granada canon in a single sitting, Los Manueles on Reyes Católicos has been trading in one form or another since 1917 and puts croquetas, tortilla del Sacromonte, habas con jamón and oxtail on one menu. It is a sensible first-night orientation meal before you know what you like.

The Realejo: the quarter to give a whole evening to

The Realejo, the old Jewish quarter climbing the slope below the Alhambra, is where this article would send you if it could only send you to one place. The bars are closer together than they look, the crowd is more local than in the centre, and the square called Campo del Príncipe gives you a natural anchor to start or finish at.

Candela opened in the mid-1990s as one of the first bars in the revived Realejo and has not felt the need to reinvent itself since: montaditos and small sandwiches, veal cooked in port, ham with artichoke and cheese. Jaraíz, a few steps off, is the wine stop. Potemkin, on the Placeta del Hospicio Viejo, has a small sunny terrace and is the one to take mid-afternoon rather than late.

Bar Ávila, over toward San Matías, is the loud, always-full local option, where the roast ham and a potato stew with cuttlefish are what regulars order around.

Taberna La Tana, near the Placeta del Agua, has been open since the early 1990s and is the reason to plan your Realejo night midweek: at the time of writing it works lunchtimes and evenings from Tuesday to Friday and closes at the weekend. It is a narrow room with a cellar far deeper than the room suggests, and wine guides including Star Wine List have singled out the list. Say roughly what you like and let them pour by the glass.

When you want to sit down, Damasqueros is in the same quarter. Chef Lola Marín, who trained with Martín Berasategui, runs a six-course tasting menu that changes weekly, with pricing that has recently been around seventy euros a head before wine. Book well ahead; the room is small.

The Albaicín: fewer bars, harder walking, better light

The Albaicín is the best-looking neighbourhood in the city and the thinnest for food, which is worth knowing before you climb it hungry. The bars are scattered rather than clustered, and the cobbles are punishing.

Plaza Larga, not the famous viewpoint, is the neighbourhood's real centre of gravity. Bar Aixa sits on it, a family place with a terrace, and is known locally for berenjenas con miel de caña, aubergine fried and drizzled with cane syrup. Higher up, Casa Torcuato runs a restaurant and a separate tapas annexe, and is where the quarter eats rather than where it photographs.

Up at the Mirador de San Nicolás, Kiki Vinos y Otras Cosas has the terrace and the Alhambra view, and you pay for both. That is a fair trade once, at sunset, with a reservation. The tea houses along Calderería Nueva, the stepped lane of Moroccan shops running up from Elvira, are worth a mint tea and a pastry as a pause between things; they are not dinner.

Getting up there is the practical question. Walk up through Calderería or along the Carrera del Darro, which is the prettier route, and let gravity bring you back down through the bars. If you would rather not climb, the small buses that leave from Plaza Nueva for the Albaicín run every few minutes through the day, and at the time of writing the C31 and C32 routes are the ones to look for.

What to order, and what is actually in season in spring

A few dishes are genuinely local rather than generically Spanish, and ordering them is how you stop eating the same tortilla four nights running.

Habas con jamón, young broad beans cooked with ham, is the spring dish and the one to order first. Remojón granadino is a cold salad of orange with salt cod, olives and onion, Moorish in origin and far better than that description sounds on a warm afternoon. Berenjenas con miel de caña uses sugar-cane syrup from the Motril coast rather than bee honey, which is why it tastes of molasses. Plato alpujarreño is the mountain plate from the Alpujarra above the city: potatoes cooked a lo pobre, egg, chorizo, blood sausage and ham, and it is a lunch, not a tapa. Look for ham from Trevélez, cured high in those same mountains.

Tortilla del Sacromonte deserves a warning rather than a recommendation. The traditional version is made with lamb offal, including brains, bound with egg, potato and sometimes chorizo. Plenty of bars now serve a milder version. Ask before you commit.

Spring is the season on record here for good reason. Green asparagus from Huétor Tájar, west of the city, carries a protected geographical indication and is hand-cut from roughly March to June; the purple-tinged tips are an April and May thing and turn up on blackboards across the city as revuelto or simply grilled. Conversely, do not arrive in spring hunting olla de San Antón, the heavy bean-and-pork stew Granada eats around the saint's day in January. It will not be there.

Market mornings, churros and piononos

Mercado San Agustín, a covered market a minute from the cathedral, is the daytime counterweight to all that drinking. The fish comes up from Motril, which is close enough that the transfer is measured in hours rather than days, and several stalls will cook what you buy for a small extra charge. It keeps market hours, meaning mornings into the early afternoon, and does not open on Sundays, so slot it into a weekday.

Breakfast is churros, and it is not the same thing as a pastry. Gran Café Bib-Rambla, on the square of the same name, does thick drinking chocolate with freshly fried churros under the plane trees. Café Fútbol, over on Plaza Mariana Pineda, is the other long-standing choice and the more local of the two. Both typically open early and run through the morning.

The local sweet is the pionono, a small syrup-soaked sponge topped with toasted cream, invented in nearby Santa Fe and named for the papal hat it resembles. Casa Ysla, which traces its history back to the 1890s, has branches around the centre including Bib-Rambla and Reyes Católicos. Two is a portion. They are very sweet.

The student streets, and when they are worth it

Calle Pedro Antonio de Alarcón, southwest of the centre, is the university's tapas artery, and it gives you the largest plate for the smallest outlay anywhere in the city. It is also loud, young and almost entirely dependent on term time: come in high summer or during the holidays and half of it is shuttered. Worth one night if stretching the budget is the point, and skippable otherwise.

Four nights, in an order that does not repeat itself

If you have the time, this is the sequence that works. Night one, the centre: an early hour on Navas at Los Diamantes, then walk to Elvira for Casa Julio and finish at Castañeda, which stays open when nothing else does. Night two, the Realejo, midweek so La Tana is open, working uphill from Campo del Príncipe and ending wherever the wine lands. Night three, the Albaicín: climb in daylight along the Carrera del Darro, take the San Nicolás view at sunset, then come down through Plaza Larga for actual food. Night four, sit down properly, at Damasqueros or Cunini, and stop grazing.

Somewhere in the middle, give a morning to Mercado San Agustín and a churro breakfast, and leave one lunch free for a plato alpujarreño, because after three nights of small plates you will want a plate.

The thing to resist is the instinct to plan every stop. Granada's system is designed around the opposite: you find a bar with a crowd of the right age and a counter you can reach, you order one drink, and you judge the place by what arrives. If it is good, order a second. If it is not, you are out three euros and the next bar is forty metres away.