Maple Onion Marmalade

I found this recipe for Maple Onion Marmalade in one of my Herb Companions and decided to make it this morning.It doesn't make much but is really beautiful in the jar. I will let you know in a few weeks if it is any good. If anyone would like to try it here is the recipe:

Maple Onion Marmalade
              
2 tablespoons olive oil
1tablespoon butter
2 pounds red onions,thinly sliced, about 4 cups
2 red peppers, halved, cored and thinly sliced
Juice and grated rind of one orange
Juice and grated rind of one lemon
1/3 cup maple syrup
2 tablespoons red wine vinegar
salt and pepper to taste

In a large , heavy saucepan, heat oil and butter. Add onions and peppers.Cover pan and gently cook for 30 minutes or until soft. Remove cover, increase heat to medium and stir in orange and lemon juice and rind , syrup and vinegar. Adjust heat until lightly simmering and cook uncovered until thickened about 15 minutes. Stir in lemon balm, salt and pepper. Taste and adjust seasonings. Increase heat and cook another 2 minutes. Spoon hot marmalade into sterilized jars, seal . Water bath 10 minutes.