2 tsp. Cajun seafood seasoning (see Note)
2 tsp. Worcestershire sauce
Tabasco sauce, to taste
In a 2-quart saucepan, heat the oil and melt the butter on medium. Add the garlic, and cook for 30 seconds. Add the chicken broth, chili sauce, seafood seasoning, Worcestershire sauce and Tabasco sauce, if using. Stir well and raise the heat to medium high. Bring to a boil. Boil and stir occasionally for 5 to 7 minutes to reduce by one-third, and thicken. Remove the sauce from heat and use. Or cool and refrigerate, covered, for up to 1 week. (The sauce also can be frozen in small portions in freezer-weight plastic containers for up to 3 months. Defrost in the refrigerator, and use within 3 days.)
To use the sauce: Brush on shrimp or seafood kebabs during the last few minutes while grilling over medium-low heat, until the seafood is done to personal preference. Additional sauce can be passed for dipping at the table.