Easy Onion and Pear Marmalade

3 T. lightly salted butter

1 C. Pear, skinned and cored, diced

3 large onions, sliced

2/3 C. firmly packed brown sugar

1/4 C. balsamic vinegar

1 tsp. finely chopped fresh rosemary

 

Heat butter in large pan, add onions and cook gently for 20 to 30 minutes until onions are very soft and lightly browned. Add pears and sugar, stir simmer uncovered, until mixture is thick and caramelized. Add vinegar and simmer uncovered for about 5 minutes until thickened slightly. Stir in the rosemary. Serve at room temp.