Caramelized Beef Skewers

1 lb beef sirloin steak, thinly sliced
1/2 c balsamic vinaigrette
1/4 c bbq sauce
1 tsp Dijon mustard

Toss steak with 2 tbsp of the dressing.
Let stand for 10 minutes.
Meanwhile, combine remaining dressing, bbq sauce and mustard.
Preheat BBQ to medium high heat.
Thread steak onto skewers.
Grill skewers for 6 minutes, until steak is cooked through, brushiong generously with BBQ sauce mixture.