Ingredients:
3 kg tripe  (6 lbs)
1 calf's foot (or 2 pig's feet)
1/2 head garlic, peeled and crushed
4 or 5 small hot red chiles
2 medium onions, sliced
3 bay leaves
1 tsp salt
1 tsp black peppercorns, crushed
2 tbsp dry Mexican oregano

Instructions:
Wash the tripe thoroughly, trim off most of the fat, and cut it into one-inch squares. Drop tripe into a pot of boiling water; simmer for 2 - 3 minutes and drain. Place back into pot, and add one calf foot, or two pig feet, cut up a bit. Cover well with water, and add remaining ingredients. Cook over very low heat for several hours until very tender.