Grilled Sirloin and Potatoes

Grrrrrgh!
Course : Grilling
From: HungryMonster.com
Serves: 4
 

Ingredients:

1 pound boneless beef top sirloin steak -- cut 1 inch thick
2 tablespoons olive oil
2 large baking potatoes -- cut lengthwise into quarters
4 slices red onion -- cut 1/2 inch thick slices
---SAUCE---
2/3 cup prepared steak sauce
1 tablespoon garlic -- crushed
 

Preparation:

In 2-cup glass measuring cup, combine sauce ingredients; cover and microwave on HIGH 2 minutes or until hot and bubbly, stirring halfway. Remove 3 tablespoons; brush onto both sides of beef steak. Reserve remaining sauce. Brush oil onto cut sides of potatoes and onion. Place steak and vegetables on grill over medium ash-covered coals. Grill uncovered 16 to 20 minutes until steak is medium rare to medium doneness and vegetables are tender, turning steak and vegetables occasionally. Brush vegetables with some of reserved sauce during last 5 minutes of grilling. Trim fat from steak. Carve steak crosswise into slices; serve with vegetables. Pass remaining sauce.