This is sooo good, it doesn't last long in my house because I keep eating it! Easier than you think and should keep for three or four days in the fridge, plus its Syn free on Slimming World
500g of thinly sliced red onions
100ml balsamic vinegar
150ml apple cider vinegar
2 tablespoons of sweetner
2 cloves of crushed garlic
2 tablespoons of chopped thyme
Salt and pepper to taste
Put all the ingredients into a large, heavy bottomed pan. Bring it up to the boil and then simmer, covered for an hour. Give it an occasional stir to make sure it doesn't burn. Remove the lid for the last 10 minutes or so, to thicken up the lovely sticky sweet syrup. Once cooled, season to taste.
I've had this with burgers, lovely and tangy in a salad, goes well with chicken and beef on the side of your plate, or stirred through plain rice or couscous to liven it up.
Go on give it a go!