Lightly souped pomfret recipe (filipino: pinangat na pampano)

Ingredients

• 1 medium size thoroughly cleaned Pomfret
• 4 pieces medium tomatoes-each cut into 4 pieces
• 2 pieces large white onion roundedly-sliced (not chopped)
• 3 pieces banana pepper (or chili finger or "sili pansigang")
• 2 grams ground black pepper
• 8 pieces cleaned mustard leaves
• 10 ml. cooking oil
• 5 ml. "patis" (fish sauce)
• 200 ml. tap water (tubig lang sa gripo nyahaha) or fish stock