1. Wash the green beans, cook them in boiling water, take them out, drain them and put them in a concave dish for later use.
2. Mix well with fresh soup, monosodium glutamate, vinegar and refined salt, mix well with mustard sauce, pour on cooked green beans, and stir well to serve.
When cooking green beans, you should master the heat, so as to keep the green of green beans unchanged.