Tomato & Sweet Potato Soup - Self Sufficient Me

Ingredients

• 1 tbsp oil
• 1 onion
• 2 sticks celery
• 1 kg sweet potato
• 750 ml pure tomato sauce (aka tomato passata)
• 4 cups vegetable stock (or use chicken stock)
• 1/2 tsp salt
• 1/2 tsp pepper
• 1/2 tsp dried chilli flakes
• 1 tbsp fresh ginger (or powdered)
• 1 tbsp fresh turmeric (or powdered)
• 2 sprigs fresh herbs (optional)
• 1 fresh chilli, sliced (optional)
• 1/2 cup raw cashew nuts (not salted!)
• 1/2 cup water