large white potatoes • carrots • loose chorizo (250 grams) • dried ancho chiles (100 grams) • garlic cloves • onion • sour cream (1/2 liter) • shredded cheese (about 2.5 oz or 1/4 pound) • Lettuce • As much oil • Enough water to boil the vegetables and 3 cups water to boil the chiles • more cup water for the sauce •