Baked Trout

2 lb trout fillet, cut into 6 pieces
Any kind of fish can be used.
3 Tbsp lime juice (about 2 limes)
1 medium tomato, chopped
1/2 medium onion, chopped
3 Tbsp cilantro, chopped
1/2 tsp olive oil
1/4 tsp black pepper
1/4 tsp salt
1/4 tsp red pepper (optional)