This is awesome for baked chicken, fish and veggies. Although you can use it as a traditional marinade, its just as good to use in a slow cooker or roasting pan and forget about the actual 'marinating' part.
1 cup maple syrup
1 cup apple cider vinegar (or 3/4 cup depending on your taste)
1/4 stick butter
Warm up all ing. in saucepan together, just enough to melt butter.