Pico De Gallo Grilled Cheese Sandwich

Pico De Gallo Grilled Cheese Sandwich Pico de Gallo: 1 tomato, diced 1/2 white onion, diced 2 tablespoons chopped fresh cilantro, or to taste (optional) 1/2 lime, juiced salt and ground black pepper to taste Sandwich: 3 tablespoons softened butter, or as needed 10 slices white bread 10 slices provolone cheese Mix tomato, onion, cilantro, lime juice, salt, and pepper together in a bowl. Spread butter onto 1 side of each bread slice. Arrange bread, butter-side down, onto a work surface. Place 1 slice provolone cheese onto each bread slice and spoon Pico de gallo layer with remaining bread-cheese slices, butter-side up. Heat a skillet over medium heat. Grill each sandwich in the hot skillet until golden brown and cheese is melted, 3 to 4 minutes per side.