Slice the top off the garlic bulbs drizzle with a little olive oil and wrap in tin foil

Roast at 200c for 45-50 mins until tender

Finely slice onions

Saute and caramelize onions with pinch of salt on low heat 

Add garlic, sugar and vinegar cook over a low heat until liquid mostly evaporates

Cool in a sterilized jar and store in fridge