Buttermilk Waffle BLT Sandwich

Name: Buttermilk Waffle BLT Sandwich
Ingredients: 1 1/2 cups all-purpose flour; 2 teaspoons baking powder; 1/2 teaspoon baking soda; 1/2 teaspoon salt; pinch of black pepper; 1 tablespoon granulated sugar; 1/3 cup melted unsalted butter; 2 large eggs; 1 1/4 cup buttermilk; 1/2 cup grated sharp cheddar cheese; 1/2 cup mayonnaise; 2 tablespoons whole grain mustard; fresh cracked black pepper; 12 slices thick bacon; 2 ripe tomatoes, sliced; romaine lettuce leaves; sea salt for sprinkling the tomatoes