Italian Sausages Peppers and Onions

I make this to serve on grinder rolls.
I use both sweet and hot sausages.
It's a good sandwich with cheddar cheese.
This is a good recipe to make ahead of time,
it keeps well inside a slow cooker.

Ingredients:
2 lb Italian sausage
2 green peppers, seeded and sliced
2 onions, peeled and sliced
black pepper to taste
4 tablespoons butter

Directions:
Cut sausage into 5-inch sections.
In a large pot, boil sausage for 30 minutes.
In a skillet, melt butter and on medium low heat,
add green peppers and onions. Cover.
Stir occasionally until peppers and onions are tender.
Remove vegetables from skillet and add sausage.
Fry on medium heat until brown.
Add green peppers and onions.
Turn off heat.
Serve on hot dog buns or grinder rolls.