Caramel Apple Galette

Name: Caramel Apple Galette
Prep time: 1 h
Cook time: 45 min
Total time: 1 h 45 min
Cuisine: European, Mediterranean, French
Ingredients: 1/2 cup unsalted butter, cold ((1 stick)); 1 1/4 cup all-purpose flour; 1/2 Tablespoon sugar; 1/2 teaspoon salt; 1/4 cup buttermilk ((or use regular milk mixed with 1/2 tsp vinegar)); 1/4 cup apple cider; 4 cups cored, peeled, and thinly sliced apples ((this was 4 medium apples for me)); 1 Tablespoon lemon juice; 1 Tablespoon unsalted butter; 1/3 cup sugar; 1 Tablespoon all-purpose flour; 1 Tablespoon cornstarch; 1 teaspoon cinnamon; 1/4 teaspoon nutmeg; Pinch salt; Heavy cream or half & half; Turbinado or coarse sugar; 1 cup granulated sugar; 1/4 cup water; 1/2 cup heavy cream; 1 tablespoon butter