Grilled Peanut Chicken and Broccolini

Name: Grilled Peanut Chicken and Broccolini
Ingredients: 1/2 c. Olive Oil, Plus More For Drizzling; 1/4 c. Peanut Butter; 1/4 c. Soy Sauce, Plus More For Serving; 1/4 c. Honey; 2 tbsp. Barbecue Sauce; 3 dashes Worcestershire Sauce; 1 whole Lemon, Juiced (or 2-3 Limes); 3 cloves Garlic; 1/4 tsp. Cayenne Pepper; 4 whole Boneless, Skinless Chicken Breasts; 8 oz. weight Broccolini; Salt And Pepper, to taste; 1 whole Onion, Sliced Thick; 8 oz. weight Thin Spaghetti Or Angel Hair, Cooked And Drained; Cilantro Leaves For Serving