Fried Green Tomato Sandwiches with Remoulade Sauce

To cook tomatoes: Preheat oven to 450 degrees F.

Whisk together buttermilk and egg white in a medium bowl. Mix together cornmeal, salt and cayenne in a shallow dish. Dip half of the tomato slices into the buttermilk mixture, then transfer to the cornmeal mixture. Gently turn each slice in the cornmeal mixture to coat.

Heat 1 teaspoon oil and 1 teaspoon butter in a large nonstick skillet over medium heat until foamy. Add tomato slices and cook until the undersides are golden brown, 4 to 5 minutes. Transfer the slices to a baking sheet, browned-side up. Repeat the process with the remaining oil, butter and tomato slices. Bake the tomatoes in the hot oven until both sides are well browned, 8 to 12 minutes.

To make remoulade sauce: While the tomatoes are in the oven, combine mayonnaise, sour cream (or yogurt), horseradish, mustard, lemon juice, cayenne pepper, scallions, gherkins (or pickle relish) and capers in a small bowl.

To assemble sandwiches: Place lettuce on the bottom halves of buns. Top with the tomato slices and remoulade sauce; cover with bun tops.