5-6 onions, thinly sliced
1 tb butter
1 pound bacon
1/2 cup cider vinegar
1/2 cup dark brown sugar
1/4 cup pure maple syrup
1/2 cup coffee
1. Cook the bacon and set aside.
2. Melt the butter then start to caramelize the onions. Add the remaining ingredients and bring to a boil. Reduce to a simmer for a short time.
3. Put the onion mixture and the bacon in the slow cooker. Cook for 3-4 hours on low. Pulse if you wish or leave as is and refrigerate.
4. Here are a few ideas to get you started regarding how to use slow cooker onion marmalade: top brie and crackers layer it in a panini, add a dollop to potato soup, use this onion and bacon relish instead of a red sauce on a pizza.