Kale Pizza with Blue Cheese and Walnuts

Name: Kale Pizza with Blue Cheese and Walnuts
Ingredients: 2 balls pizza dough (~10 ounces each, preferably whole wheat); 2 tablespoons olive oil, plus more for drizzling; 2 cloves garlic, minced; 1 bunch kale, if it's really large, or two smaller bunches (I like Red Russian), washed and dried and roughly chopped; 1 wedge lemon; Handful flour or semolina, for dusting; 1/3 cup roughly chopped walnut halves (do not toast, as they'll brown in the oven); 1/4-1/3 cups crumbled blue cheese, depending upon your taste; 1/2 red or yellow onion, sliced into thin half-moons; salt