Caprese Panini

Ingredients

• 2 tablespoons olive oil, divided
• 0.75 cup diced tomato
• 1 tablespoon drained capers
• 1 pinch red pepper flakes
• 0.5 teaspoon balsamic vinegar
• 4 slices sourdough bread
• 0.25 cup prepared pesto
• 1 (6 ounce) package sliced mozzarella cheese
• sea salt and coarsely ground pepper to taste