Red onion tarte tatin - Good Food Middle East

Ingredients

• 320g sheet ready-rolled puff pastry
• 50g unsalted butter
• 3 large red onions, cut into wedges, leaving most of the root intact
• 2 tbsp balsamic vinegar
• 30g light brown soft sugar
• small handful of flat-leaf parsley, roughly chopped
• small handful of mint, leaves picked and roughly chopped
• small handful of chives, finely chopped
• 2 tbsp capers, roughly chopped
• 1 lemon, juiced
• 1 tbsp red wine vinegar
• 80ml extra virgin olive oil