Bake This Colorful Winter Citrus Galette

Ingredients

• 1 1/2 cups all-purpose flour
• 3/4 teaspoon granulated sugar
• 1/4 teaspoon kosher salt
• 9 tablespoons cold unsalted butter
• 3 to 5 tablespoons ice water
• 1/2 cup granulated sugar
• 1 tablespoon light corn syrup
• 3 tablespoons water
• 3/4 teaspoon ground cumin
• 2 tablespoons unsalted butter
• 1/4 cup heavy cream
• 1 teaspoon finely grated blood orange zest, or the zest of any orange
• 2 1/4 pounds assorted winter citrus, such as navel, cara cara, and blood oranges
• 3/4 teaspoon cornstarch
• 1 large egg
• 2 teaspoons water
• Pinch kosher salt
• 1 tablespoon turbinado sugar (optional)
• 1 1/2 teaspoons unsalted butter