not exactly chinese style, but rather tasty over veggies, or pork, or chicken all the same,
1 chicken or veg stock cube
1/3 pint water
2 desert spoons of mustard
a load of grated cheese
add the boiling water to stock cube in saucepan, add the mustard, and stir in the grated cheese. or you can replace the cheese with cream / creme freche.
amounts are to taste really, and you could always thicken a bit more with cornflour, but i was surprised it went reasonably thick just with the cream or the cheese.