bistek recipe

Ingredients: 1 pound beef sirloin or round steak, thinly sliced 1/4 cup soy sauce 1/4 cup calamansi juice or lemon juice 4 cloves garlic, minced 1 large onion, sliced into rings 1/2 teaspoon black pepper 2 tablespoons cooking oil 1/2 cup water Salt to taste Optional: 1 teaspoon sugar for a touch of sweetness