I live in Portland, Oregon, a city in which notifying your host of your eating restrictions is just good manners. Maybe you too have friends who are vegan, vegetarian, or gluten-free. Or lactose-intolerant, paleo, or perhaps adhering to my toddler’s diet, which is best described as “pepperoni.” In this fraught environment, pizza has saved our social life. Pizzas are customizable and dough is cheap to make.

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