Steak and Potato Stir Fry

1 lb beef sirloin steak, cut into thin strips
1 tbsp oil
2 c cubed potatoes
2 c chopped carrots
1/4 c water
2 c each: sliced mushrooms and onions
1/4 c balsamic vinaigrette dressing

Cook and stir meat in oil in skillet on high heat for 2 minutes untill browned. Remove from skillet; set aside.
Add potatoes, carrots and water to pan.Bring to a boil and cover. Reduce heat to low and simmer for 15 minutes.
Stir in mushrooms, onions, dressing and meat.Cook on high heat for 5 minutes until heated through.