Sweet red onion offsets bitter broccoli rabe for a delectable and grown-up pizza topping.
Preheat oven, preferably convection, to 500 degrees. Blanch broccoli rabe in a pot of salted water until tender; run under cold water, and drain. Toss 1 1/2 cups broccoli rabe with oil, onion, and red-pepper flakes; season with salt.
Spread cornmeal on a baking sheet. Stretch dough into a 9 1/2-inch round; transfer to baking sheet. Drizzle dough with oil, and arrange broccoli rabe on top, leaving a 1/2-inch border. Bake until crust is golden brown and cooked through, about 12 minutes (20 minutes if not using convection oven). Drizzle with oil, and top with cheese.