Chunky chop all of your veggies and place the heaviest root vegetables down on the bottom of a double steamer saucepan system through to the light leafy vegetables on the top. I have steamed potato, pumpkin, sweet potato, Zucchini, broccoli, cabbage and asparagus and then topped them all with a thin mushroom gravy. Reserve some of the water after cooking as this is used to make the gravy.
Mushroom gravy is made by sautéing sliced mushrooms in a little olive oil, add a heaped fork full of a commercial gravy mix and stir into the mushrooms. Gradually start adding a little of the steamed veggie water until a thin gravy is achieved.