Trippa alla Romana: Roman Style Tripe in Tomato Sauce

Bahan-bahan (4 porsi)

• 1 lb honeycomb tripe
• 1 -2 ounces chopped guanciale (optional)
• 1/2 onion (chopped)
• 3 cloves garlic (minced)
• pinch of crushed red peppers (to taste)
• 1 tbsp tomato paste (optional)
• 14 oz canned tomatoes
• salt and freshly ground pepper
• freshly ground parmesan (to finish)