Meat and Collards Pizza

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1 pound frozen pizza dough, thawed and at room temperature

Cornmeal, for sprinkling

1 small red onion, half thinly sliced and half chopped

Kosher salt and freshly ground black pepper

3/4 teaspoon crushed red pepper flakes

1/2 cup grated Parmesan, plus more for sprinkling

5 tablespoons extra-virgin olive oil

3 garlic cloves, minced

1 1/2 teaspoons sweet paprika

3 tablespoons tomato paste

6 ounces 80 percent lean ground beef

6 ounces frozen collard greens, thawed and drained 

Grated zest of 1 lemon (about 1 tablespoon)

2 teaspoons fresh lemon juice