Pre-heat a sauce pan, pour cooking oil, wait until its hot, cook onion and garlic, stir it well until the aroma comes out. Put chilies, bay leaves, galangal, and tomato in, stir it well. Sprinkle salt, sugar, and pepper, put bitter melon in, stir it until it mixes well. Pour some water in and wait until its cooked well. (When the bitter melon turns soft it means its cooked well) try the taste.