First you need to clean the kidneys and wash well - that is, split them and remove excess. Then cut into cubes and washed by washing with vinegar to rob odors. Then put them to boil, as the water add 1 cup beer and 1 cup red wine. Boil about 15 minutes. Peel the potatoes and cut into cubes, put in a pan, add to the kidneys, then sprinkle with sunflower oil, add spices and pour the broth from the kidneys add more 1 cup red wine. Put to bake in a hot oven (preheated). Dish, stirring occasionally, mainly to bake is well and add the mushrooms are cut in large pieces. Mushrooms must be finally put to not melt. Preferably the dish is served warm.