First of all, clean the kidney and cut it in slices and introduce it into a bowl with water, salt and 2 dl. of vinegar. Leave it there for 15 minutes. Put a pan with water in the fire and cook it with the steam. The kidney will release liquid slowly.
After 10 minutes, put the kidney into a strainer and wash it very carefully with cold water. Smash the salt, the garlic and the parsley. Put the olive oil into a saucepan and add the chopped onion. When the onion is almost transparent, add the kidney and stir it. Add the chilli (optional), the paprika and the flour. Keep stirring it; add the water and the mixture of garlic and parsley. Stir it up and cook it for 5 to 8 minutes. The Sherry is added just before serving.
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