1In a large skillet cook sausage links over medium heat about 5 minutes or until brown,turning frequently.Carefully add water.Bring to boiling;reduce heat.Simmer,covered,for 5 minutes.
Uncover and cook sausages,turning frequently until liquid evaporates and sausages are cooked through(160F)
Watch carefully so that sausages do not burn.
Drain sausages on paper towels.Wipe out skillet,if necessary.
2In the same skillet add the oil,green peppers,red sweet peppers and onion.
Cook and stir about 5 minutes or until vegetables are crisp tender.
Return sausage links to skillet.
Combine the salad dressing and mustard.
Stir into mixture in skillet.
3To serve, hollow out bottoms of rolls or buns.
If desired,toast roll halves 4" from the heat of the broiler for 2-3 minutes.
Top with the sweet pepper mixture and roll tops.
(**If desired,do not split the rolls.Instead cut the unsplit rolls through the top and almost to the bottom. Add cooked sausages and vegetable mixture.)