Preheat oven to 400 degrees.
Prepare the dough according to the package instructions- beat the egg whites a few minutes, then mix the water, eggs, and vinegar into the bread mix. Knead for 1 minute.
Split the dough into 6 equal sized balls and roll them out into a log. Place the logs onto a parchment lined baking sheet and use a knife to make 4 slits on top of each. This will help it cook evenly.
Bake about 35 minutes until nicely browned and cooked through.
Allow to cool for a half hour, then slice down the center to form buns.
Preheat a grill to medium.
Cook the sausages on the grill to brown and cook through, about 20 minutes.
Use a pan on the grill, or a veggie grate to char the peppers and onions.
Put the sausages into the buns and top with the peppers and onions.
Serve.