For a new summer favorite, brush shrimp or chicken kabobs with a sauce that's based on the classic Margarita cocktail.
Thaw shrimp, if frozen. Peel and devein shrimp, leaving tails intact. Rinse shrimp and pat dry. Cut chicken, if using, into 1-inch chunks. Thread shrimp and/or chicken, sweet pepper, and onion onto six 10- to 12-inch skewers.
In a small saucepan stir together the marmalade, lime juice, tequila, if you like, cooking oil, cilantro, and garlic. Cook and stir just until marmalade is melted. Divide mixture in half.
Grill kabobs on a greased rack of an uncovered grill directly over medium coals for 10 to 12 minutes or until shrimp turn pink or chicken is done, turning once. Add pineapple to grill rack and brush kabobs and pineapple with 1/2 of the sauce mixture during the last 5 minutes of grilling. Turn pineapple once during the last 5 minutes of grilling.
Pass remaining half of sauce with kabobs and pineapple. Makes 6 servings.