Roasted Red Onion Juice

• 5 red onions
• 100 ml (3½ fl oz) olive oil
• fine sea

Preheat the oven to 200°C (400°F/Gas 6).

Peel off the first layer of skin from the onions and place the onions in a large bowl. Pour the olive oil over the onions and season well with salt and pepper. Put the onions on a rack placed in a baking tray. Cover the tray with foil an