Wrap it in a towel or wool blanket and put it on the rear racks? I know it is unreasonable to bring home piping hot pizza on a bike.
We are in a new neighborhood and my wife has the now ubiquitous wheat allergy, though we have been doing it for over 10 years. But to make it worse she developed a tomato allergy after our sons birth. The worst allergy in the world in my mind.
So I do not go searching for pizza places much. We make hers from scratch and I go the lazy route and buy frozen.
I make a mean bbq chicken (homemade bbq sauce), with homemade pesto, spinach, red onion and mushroom pizza. Man I want that now. That might be Tuesday or Thursday night's dinner.