Preheat oven to 425°F.
1. In a large skillet, heat 1 tablespoon olive oil over medium heat. Season fish fillets with salt and pepper. Cook until golden brown. Turn and put into hot oven for 10 minutes.
2. In a food processor, combine garlic, nuts, cilantro leaves, and olive oil. Pulse to make pesto. Season with salt and pepper to taste.
3. Smear ¼ cup pesto onto a plate. Place fish on pesto and garnish with red pepper flakes.