This sweet and savory jewel - tone red onion jam, which can be made a day or several days ahead. (vegkitchen.com)
A couple of months ago my friend brought me some bacon onion jam and was possibly the best thing I've ever put in my mouth... and on a burger, Oh my. (girlinthelittleredkitchen.com)
Go a stretch longer to get them a little more, well, caramel - colored; great for onion jam. (bonappetit.com)