onions, one small and one large • little more than 1/2 cup whole milk (about 140 ml) • cheese (such as American, mozzarella, or any melting cheese) • sugar • saltine or water crackers • salt • large potatoes • spaghetti (about 400 grams) • medium tomatoes • tomato paste • large or 5 small yellow Peruvian peppers (ají amarillo) • ají panca paste •