Italian Sausage with Peppers & Onions

1 dozen Italian Sausages
1 dozen Sausage/Brat Rolls

3 large yellow onions
2 tablespoon olive oil
1 green bell pepper
1 red bell pepper
1 clove garlic
2 tablespoon red wine vinegar
1/4 teaspoon red pepper flakes (optional)
1/2 teaspoon kosher salt
1/4 teaspoon ground black pepper
1/2 tablespoon tomato puree (optional)

The peppers & onions can be cooked ahead of time at home and then reheated on the grill using an aluminum pan.

Slice the onions into 1/8-inch-thick half-rounds.

Heat the olive oil in a large saute pan over medium heat. Add the onions and saute for 15 to 20 minutes.

While waiting for the onions, julienne the peppers and mince the garlic.

Add all the other ingredients and continue cooking an additional 10 minutes.

Cook the sausages to your liking on the grill. Use a good sausage roll (don't ruin it with a cheap hotdog bun). Top the sausage with the peppers & onions.