Sweet Potato & Watercress Soup | Vegan Soup Recipe

Ingredients

• 1 onion
• 2 cloves garlic, crushed
• 1 tbsp olive oil
• 2 celery stalks, finely sliced
• 4 cups vegetable stock
• 2 sweet potatoes, peeled and cut into cubes
• 1 bunch watercress
• 2 heaped tbsp sweet white miso