Marinade/rub
Combine all ingredients except the tenderloin and asparagus in a bowl, setting aside a small portion of mix to be used for asparagus. Rub beef tenderloin with mixture, then wrap beef in plastic wrap, refrigerate, and allow to marinate for 30 minutes.
While meat is marinating, preheat grill to medium heat and prepare asparagus be washing and trimming ends. Lay asparagus spears on aluminum foil (leave excess aluminum foil at the edges). Sprinkle remaining marinade mix over asparagus spears. Add 1-2 Tbsp water. Fold foil by tucking ends and creating a tent. Place on grill, leaving ends folder. Grill beef 15-25 minutes or until desired temperature. Continue to cook asparagus until al dente.
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