Pistou soup - Good Food Middle East

Ingredients

• 2 tbsp olive oil
• 1 onion, finely chopped
• 2 each medium carrots and celery sticks, peeled and finely chopped
• 1 small fennel bulb, trimmed and finely chopped
• 250g each turnips, celeriac and parsnip, peeled and finely chopped
• 140g frozen peas
• 140g tinned haricot beans or dried haricot beans soaked overnight
• large bunch basil
• 1 clove garlic
• 100ml extra-virgin olive oil
• grated parmesan and croûtons, to serve