Heirloom-Tomato Sandwiches

Preheat oven to 350 degrees F. Meanwhile, in a small bowl, combine 1/2 cup mayonnaise, 1 minced garlic clove, and 1 tablespoon chopped fresh tarragon. Set aside. Place 4 slices of prosciutto (about 2 ounces) on a baking sheet and bake until crispy, 12 to 15 minutes.

Meanwhile, spread 1 slice of white bread with 1/2 tablespoon softened butter on each side; repeat for 3 more slices. On a grill pan over medium-high heat, grill bread until golden and slightly charred, about 2 minutes per side.

To assemble each sandwich, spread 2 tablespoons of reserved tarragon aioli on bread. Layer on 3 slices of heirloom tomatoes, then top with crumbled prosciutto. Sprinkle on sea salt and freshly ground pepper.