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Preheat oven to 400°F. Place lemon juice, 2 tablespoons of the Peruvian Seasoning and garlic in food processor or blender; cover. Process just until smooth. Gradually add oil with the machine running. Process until well blended and smooth. Set aside.
Pat chicken dry with paper towels. Place chicken in large cast iron or oven-proof skillet. Rub remaining 1 tablespoon Seasoning under skin of chicken. Rub reserved lemon and garlic seasoning mixture evenly over chicken skin.
Place chicken breast-side down on large cutting board. Using poultry shears or kitchen scissors, cut along both sides of backbone to remove it. Discard backbone. Flip chicken breast-side up and flatten by pressing down firmly with both hands on breastbone and breasts until you hear a crack and chicken resembles one large flat section. (You can also ask the butcher where you shop to butterfly and flatten the chicken for you.)
Roast chicken 50 to 55 minutes, basting with pan juices every 20 minutes, until the internal temperature is 165°F. Transfer chicken to a clean cutting board and let rest 15 minutes before slicing. Serve with Creamy Cilantro Sauce.
For the Creamy Cilantro Sauce, place all ingredients in food processor or blender; cover. Process until smooth. Serve with chicken.