Calming green soup - Good Food Middle East

Ingredients

• 1½ tbsp vegetable oil
• 2 red onions, chopped
• 2 garlic cloves, finely grated
• 2 tsp cumin seeds
• 2 courgettes, roughly chopped
• 1 large potato, around 300g, peeled and roughly chopped
• 1.3 litres vegetable stock, made with a low-salt stock cube
• 250g frozen peas
• 400g baby spinach
• 20g mint, roughly chopped, a few leaves left whole (to serve)
• 150ml pot low-fat natural yogurt, to serve