Use fresh ingredients, especially yeast and flour, for the best dough rise and texture.  Knead the dough until smooth and elastic; add flour if sticky.  Let the dough rise in a warm, draft-free place, such as an off oven or near a warm appliance, until doubled in size. Finely chop the onion for even distribution, using a food processor if needed.  Mix the topping ingredients thoroughly for balanced flavor. Preheat the oven fully before baking to ensure even cooking and a golden crust.