I first make my own hummus by mashing up 1 can of chick peas, 3 tablespoons of Tahini, 3 tablespoons of lemon juice, 1/3 cup of water, and 1 clove of garlic (I think this is a recipe I got from this website).
Spray a sheet of wax paper with non-stick cooking spray or use olive oil. Roll out pizza dough on wax paper. Make a rectangle with dough.
Spread a good amount of hummus on the dough leaving a little room at the edges. Then spread tomato and onion on the dough, again, leaving room at the edges.
Finally roll the dough length wise and bake according to directions for the pizza dough. (I cut my dough into 8 slices before cooking; however, if baking sheet is large enough, you can cut it after baking).