Boursin Spring Galette

Name: Boursin Spring Galette
Ingredients: 3/4 cup frozen peas; 8 tablespoons (1 stick) cold unsalted butter; 1 1/2 cups all-purpose flour, plus more for dusting; 1 1/4 teaspoons kosher salt, divided; 1/4 cup plus 3 tablespoons ice water; 1 (5.2-ounce) package Boursin Garlic & Fine Herbs cheese; 1 medium leek; 1 bunch asparagus, preferably (about 1 pound); 3 ounces radishes (4 to 5 medium); 1 medium lemon; 2 1/2 tablespoons olive oil, divided; 1/4 teaspoon freshly ground black pepper