Mmmm grilled to perfection!
1 pounds top sirloin steak
yellow bell pepper.
2 T olive oil
2 T grainy mustard
1 T red-wine vinegar
1 T fresh thyme leaves
salt and ground pepper
Slice the steak into 1" or larger cubes.
In a small bowl, whisk together oil, mustard, vinegar, and thyme. Pour marinade over the beef (and vegetables if desired, however I prefer just the beef marinated). Let marinade in the fridge for at leat 2 hours in the refrigerator, turning periodically.
Assemble the skewers about 4 long ones, alternating beef with vegetables (4-5 beef per skewer is what I like).
Heat grill to high and place the skewers on a greased grill. Grill 1-2 mins per side for medium rare. Serve with side of salad or on a bed of couscous.