Rainbow Veg Sauce - Veg Power

Ingredients

• olive oil
• 1 onion, finely diced
• 2 carrots, finely diced
• 2 sticks of celery or 1/2 fennel bulb, finely diced
• 1 sweet potato, finely diced (optional)
• 1 courgette, finely diced
• 500g passata + 500ml water or stock (or use 700g of roughly chopped ripe tomatoes and only 250ml water or stock)
• 1 tbsp mixed dried herbs or dried oregano
• salt & pepper