Beef ampalaya con tuna

Ingredients

• 1 tablespoon cooking oil
• 1/4 cup sliced onions
• 1/4 kilo beef strips
• 2 cups water
• 1/2 cup tomato sauce
• 1 tablespoon tausi
• 2 cups sitaw, cut into 1? length
• 1 tablespoon oyster sauce
• 3 cups sliced ampalaya
• 1/2 cup canned tuna in water
• 1 pack 7 grams AJINOMOTO GINISA All Purpose
• 1 small head lettuce