Process orange juice, oregano leaves, cilantro leaves, lemon juice, lime juice, olive oil, minced garlic, jalapeño chiles, agave nectar, and salt in a food processor until smooth, about 1 minute. Place your favorite cuts of meat (we recommend chicken thighs, breasts, wings, leg quarters, or pork shoulder roast) in a large ziplock plastic freezer bag. Pour marinade over meat. Seal bag, and massage marinade into meat. Chill. (See "Marinade Basics," below, for guidelines.) Remove meat from marinade, and cook as desired.