Photo: du Barry bagel; 2008. Bagel, cauliflower, cheese; mixed media. From author’s private collection. “Pizza!” so begins a song beloved by millions, “pizza in the morning, pizza in the evening, pizza at supper time. When pizza’s on a bagel, you can have pizza anytime.” That timeless anthem conveys a fundamental truth: pizza bagels are a kind of sublime food, except if you’re lactose intolerant, hate tomatoes, or have Celiac disease. So it may come......