Cherry Tomato & Cheese Galette

Ingredients

• For the dough
• 1-⅓ cup all-purpose flour
• 2 tablespoons cornmeal
• ½ teaspoon fine salt
• ½ cup unsalted butter, cubed, frozen
• 1 tablespoon cider vinegar
• ¼ cup ice water
• For the filling
• 8 ounces soft goat cheese or other fresh cheese
• 1 egg yolk
• ¼ teaspoon freshly ground black pepper
• pinch cayenne
• 2 tablespoons sliced basil
• For the rest
• 3 cups cherry tomatoes, halved
• 1 tablespoon olive oil
• 1 teaspoon Dijon mustard
• sea salt to sprinkle over the top once cooled, optional