Tomato Ricotta Galette

Ingredients

• 2 teaspoons olive oil
• 1/3 cup finely chopped onion
• 1 oz grated Parmesan cheese
• 1/4 cup ice water
• grated Parmesan cheese
• 1 cup all-purpose flour
• 1 oz feta cheese
• 2-3 tomatoes
• kosher salt and pepper
• 5 oz ricotta cheese
• 1 large egg
• 1/2 teaspoon salt
• 1 tablespoon water
• fresh parsley leaves
• 1/4 teaspoon kosher salt
• 1/2 cup 1 stick unsalted butter, frozen