The ingredients that would make a veggie burger taste better are pretty much the same as that of a regular meat burger. Think onions, especially red onions, seasoned salts, spices and herbs (especially we like taco or burrito and fajita seasoning blends), mushrooms or mushroom stock powder, veggie stock powder, garlic, pesto, and cheese (can be vegan cheese too). Try my easy vegan parmesan cheese recipe, which tastes so incredible on top of ANYTHING!