Sticky Tofu (based on Sticky Chicky)

Ingredients

• 1 lb. firm tofu
• 1 tbsp. sesame seeds
• 2 tbsp. soy sauce
• 1 red pepper, cut in chunks
• 1/2 green pepper, cut in chunks
• 4 scallions, cut in 1/2" pieces
• 1 can water chestnuts, halved
• 1 cup canned pineapple chunks, drained
• 1 tomato, cut into chunks