Preheat oven to 400°. Place large roasting pan or oven-safe skillet over medium-high heat. Sprinkle pork with 1/2 teaspoon salt and pepper. Add 1 teaspoon oil and pork to pan, and cook 4 to 6 minutes or until browned, turning once.
Place pan with pork in oven and roast 20 to 25 minutes or until internal temperature of pork reaches 145°. Place pork on cutting board and loosely cover with foil. Let stand 15 minutes before slicing.
Meanwhile, in food processor with knife blade attached, purée garlic, onion, broth, pumpkin seeds, cilantro, cumin, remaining 1/2 teaspoon oil and 1/4 teaspoon salt. To serve, slice pork and serve with pesto.