Kielbasa or Bratwurst in Beer & Onions

This is one of my absolute favourites and another I often make substitutions on, varying the types of sausages and beers.

4 tablespoons butter
3-4 small onions
1-2 lbs. kielbasa, bratwurst or other sausage
1 12 oz. bottle dark beer
Dijon mustard

In heavy saucepan, melt butter & sauté onions until translucent over medium heat. Add sausage to pan & brown 3-4 minutes on each side. Pour beer over sausage & onion; bring to boil and reduce heat. Simmer uncovered 25 minutes. Remove kielbasa & onions from pan, place on dish and put in warm oven (approx. 150). Reduce beer over high heat to about ½ cup (about 4 mins). Pour over sausage and serve.

*Suggestion for sides: homemade potato pancakes and spinach
*Serve with dijon or other spicy mustard
*Feel free to experiment with different beers, sausages, and even try adding fruit such as apples with the onions.