Ingredients

• 1 tbsp olive oil
• 1 large onion, diced
• 500g courgettes, chopped
• 50g potatoes, peeled and chopped
• 1 clove garlic, peeled and crushed
• about 1 litre vegetable stock
• 200g watercress, thicker stems removed
• 1 tbsp pine nuts
• salt and pepper
• 1 tbsp grated Parmesan
• fresh basil leaves