Soften the bean threads in a bowl of boiling water for 2 minutes. Drain and cut into 6-inch [15 cm] lengths. Chop the Onion coarsely with the metal blade of a food processor, about 4 pulses. Set aside. Chop the tomato coarsely, about 4 pulses. Melt the butter in a large saucepan. Add the Onion, tomato, Pork, and water and simmer over low heat until just tender, about 1 hour and 35 minutes. Add the bean threads, chile peppers, and salt and pepper to taste and simmer until heated through, about 10 minutes. Makes 6 servings