Tomato Galette Recipe

Ingredients

• 1.3333333730698 cups all-purpose flour
• 2 tablespoons cornmeal
• 0.5 teaspoon fine salt
• 0.5 cup frozen unsalted butter, cubed
• 1 tablespoon apple cider vinegar
• 0.25 cup ice water
• 1 (8 ounce) package soft goat cheese
• 1 egg yolk
• 0.5 teaspoon kosher salt
• 0.25 teaspoon freshly ground black pepper
• 1 pinch cayenne pepper
• 2 tablespoons sliced fresh basil
• 3 cups cherry tomatoes, halved
• 1 tablespoon extra-virgin olive oil
• 1 teaspoon Dijon mustard
• 1 egg, beaten
• 2 teaspoons water
• 2 tablespoons freshly grated Parmigiano-Reggiano cheese, or to taste
• 1 teaspoon extra-virgin olive oil, or as desired
• sea salt to taste