Madrid-style Riñones al Jerez: the classic tavern recipe

Few tapas sum up Madrid’s castizo cooking as well as a plate of riñones al jerez with bread for mopping up the sauce. It was born in the city’s taverns and comedores —those with zinc bars, paper tablecloths and vermouth before lunchtime— using cheap offal and a splash of the sherry that was always behind the counter. They were served in small clay casseroles, piping hot, with plenty of sauce and a cuartillo of wine.

Today it remains one of those recipes that separates those who know how to cook offal from those who don’t. If your kidneys have ever come out with an ammoniac taste or as tough as a shoe sole, the kidney was not to blame: it was the cleaning and the cooking time. Here are both explained properly.

Quick recipe card

Detail	Value
Servings	4 as tapas, 2 as a main course
Active time	25 min
Total time (including soaking)	2 h 30 min
Difficulty	Medium (cleaning is key)
Allergens	Sulphites (sherry), gluten (flour)

Where riñones al jerez come from

The dish is a child of early 20th-century Madrid, when offal was the everyday resource of working-class taverns. Sherry came in twice over: as a cheap aromatic (a bottle of oloroso or amontillado would last weeks open on the bar) and as a way to tame the strong flavour of the kidney. In the classic taverns —Casa Labra, Los Caracoles, La Dolores— it was a fixed chalkboard dish, served in an individual small casserole.

What is “Madrilenian” here is not the kidney (it is eaten all over Spain) but the combination: lamb kidney, slowly cooked onion, a good splash of dry sherry and nothing else. No cream, no mustard, no mushrooms. That is cooking from somewhere else.

Which kidney to buy

Suckling lamb kidney is the king for this recipe: small, tender, clean flavour. Ask your butcher for whole, fresh kidneys, with their white fat wrapped around them (that layer is called suet and is discarded). If only veal is available you can use it, but it needs more soaking and the result is heavier.

Allow 150-180 g of cleaned kidney per person for tapas, 250 g as a main course.

Ingredients (for 4 tapas)

• 600 g of lamb kidneys cleaned (about 800 g with fat)
• 1 medium onion (150 g), finely chopped
• 2 garlic cloves, chopped
• 150 ml of dry sherry (oloroso or amontillado, never sweet)
• 100 ml of meat stock or water
• 1 level tablespoon of flour (10 g)
• 40 ml of extra virgin olive oil
• 1 bay leaf
• 1 teaspoon of chopped parsley
• Salt and freshly ground black pepper
• For cleaning: 500 ml of milk, 2 tablespoons of white wine vinegar

How to clean lamb kidneys (the step you cannot skip)

The whole dish depends on this. A badly cleaned kidney tastes of ammonia and ruins the recipe.

1. Remove the fat and the outer membrane. With your fingers and a small knife, strip off the layer of suet and the thin membrane covering them.
2. Split them in half lengthwise and trim the white internal parts (ducts and sinews). These are responsible for the strong flavour.
3. Cut them into bite-sized pieces, about 2 cm.
4. First rinse: put them in a bowl with cold water and the 2 tablespoons of vinegar. Leave for 15 minutes. You will see the water turn cloudy.
5. Drain and transfer them to the milk. Cover them well and leave them 2 hours in the fridge. The milk neutralises the enzymes that give that sharp taste.
6. Drain, rinse with cold water and dry very well with kitchen paper. If they are still wet they won’t sear and will release grey liquid into the pan.

Step-by-step preparation

1. Sear the kidneys over high heat (3 minutes). In a wide pan with 20 ml of very hot oil, sauté the kidneys in two batches (if you put them all in together, they will stew instead of searing). Aim for browning on the outside and pink inside. Remove to a plate and set aside with their juices.
2. Soften the onion and garlic (10 minutes). In the same pan, lower the heat to medium, add the remaining 20 ml of oil and the onion with a pinch of salt. When it is translucent, add the garlic and bay leaf. Don’t let the garlic burn: it turns bitter.
3. Add the flour (1 minute). Sprinkle the tablespoon of flour over the onion and stir well so it toasts lightly. This will thicken the sauce later.
4. Deglaze with the sherry (3-4 minutes). Turn up the heat, pour in the 150 ml of sherry and let the alcohol evaporate. The sauce should smell of toasted wine, not spirit.
5. Incorporate the stock (2 minutes). Add the 100 ml of stock and let it reduce until the sauce coats the spoon.
6. Return the kidneys with their juices (2 minutes maximum). Mix, give it a short simmer and turn off the heat. If they stay in the sauce for more than 3 minutes they harden. It is the most common mistake.
7. Adjust the salt and pepper, sprinkle with parsley and serve immediately in a hot clay casserole.

Tips and common mistakes

• The total time the kidneys spend on the heat should not exceed 6-7 minutes. Any longer and they become rubbery. Like liver: short cooking or nothing.
• If the sauce is thin, remove the kidneys and reduce the sauce over high heat for 2 more minutes. Never cook the kidneys to thicken it.
• The sherry must be dry. An oloroso from Jerez-Xérès-Sherry PDO or an amontillado. If you use a sweet one (PX, cream), the dish tilts towards dessert.
• Brandy version: some taverns finish with a spoonful of Jerez brandy at the end, flambéed. It adds depth but slightly masks the wine’s nuance.

Pairing and serving

Serve them in a very hot clay casserole with rustic bread for mopping up —essential—. In Madrid the classic accompaniment is a cold caña or a glass of the same sherry used in the sauce. If you prefer red, a young Rioja crianza holds up well alongside the dish without overpowering it.

As a tapa, a small plate of kidneys opens the meal well before a Madrid cocido or some callos. As a main course, serve with French fries or plain white rice on the side.

Frequently asked questions

Can riñones al jerez be frozen? Better not. The texture of the kidney loses a lot when thawed: it turns grainy. If you have leftovers, keep them in the fridge with the sauce, covered, for a maximum of 2 days. Reheat over very low heat, without boiling.

Can I use veal kidneys? Yes, but they need 4 hours in milk instead of 2, and the final flavour is heavier. Cut them smaller (1.5 cm) and the searing time rises to 4 minutes.

And if I don’t have sherry at home? An oloroso from Montilla-Moriles PDO works just the same. A fino also works, though the sauce comes out lighter. What doesn’t work: any white wine. You lose all the character of the dish.

How do I know when they’re done? When you cut a piece, the inside should be pink, never bloody or grey. Firm texture but yielding to the bite. If they bounce back, you have overcooked them.

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