Pizza with Caramelized Onions, Gorgonzola and Walnuts

Directions

1Heat oil in a 12-inch heavy skillet over medium heat until it shimmers, then cook onions with ½ teaspoon salt and ¼ teaspoon pepper, covered, stirring occasionally, until golden, 15 to 20 minutes. Transfer to a small bowl and keep warm, covered.

2Put a large heavy baking sheet (17 by 14 inches) on lowest rack of oven, then preheat oven to 500°F.

3Meanwhile, roll out dough on a lightly floured surface with a floured rolling pin, stretching corners with your hands to form a 16- by 13-inch rectangle. (Dough will be easier to roll out as it warms.) Transfer to a large tray lined with a sheet of parchment paper. Lightly prick dough all over with a fork, then slide dough (on parchment) from the tray onto a hot baking sheet.

4Bake until top is puffed and pale golden in patches, about 10 minutes. (Prick any large bubbles with a fork and flatten.) Remove crust from oven and leave the oven on.

5Sprinkle crust evenly with cheese and walnuts. Bake pizza until the edge of crust is deep golden, cheese is bubbling and golden in patches, and the underside is golden brown, 2 to 4 minutes. Serve immediately.