Saute the ground spices with a little oil until fragrant, put onion, Stir back.
Add water then put oyster sauce, sweet soy sauce, soy sauce, sesame oil. Stir well, Let simmer and taste correction. If the taste is according to taste enter the flat noodles, sausage and mustard greens. Stir well. Cook until the water runs out (seep into the noodles).