To make mojo verde, use mortar and pestle to grind garlic and salt into smooth paste. Add cilantro/parsley and cumin seeds, and continue to grind. Slowly pour in olive oil while grinding. Add Sherry vinegar and 1 teaspoon cold water. Combine well. Cover and refrigerate for 1 hour.
If using grill, set to high heat. Add rosemary sprigs to fire, and cook presa Ibérico de Bellota for 4–5 minutes on each side, or until internal temperature is 130˚F for medium-rare. Rest meat for 5 minutes, then sprinkle with flaky sea salt.
If cooking indoors, heat oven to 450˚F. In large cast-iron pan on stovetop over high heat, warm 1 tablespoon vegetable oil. Sear presa for approximately 2 minutes on each side. Place rosemary sprigs on presa, and transfer pan to oven. Cook for 5–7 minutes, or until internal temperature is 130˚F for medium-rare. Rest meat for 5 minutes, then sprinkle with flaky sea salt.
Divide presa between two plates. Serve with mojo verde, peppers and pan con tomate. Serves 2.