Heat the pan, saute onion in margarine, add seasoning, pepper, 1 tsp of sugar, and sweet soy sauce. Cook well, set aside.
Place a steamer over boiling water and let simmer
Using mixer, beat eggs and sugar until foamy on medium speed. Pour in flour, mix well, on low speed. Add in melted margarine, mix well, add in milk, mix well.
Line wax paper on the pan, pour half of the batter, steam for 7-10 minutes
Color the remaining half batter, green or any other color you prefer.
Spread the cooked beef on top of the steamed cake, then top with the remaining batter, steam for another half hour.