A super simple soup of watercress and sweet potato. Watercress is very low calorie and low carb, but provides lots of vitamins such as A, K and C.

Add the oil to a large saucepan or stock pot over a medium heat
Add the onion, garlic and sweet potato and stir as the onions soften for a few minutes
Add the stock, salt and pepper, cover and simmer for about 10 minutes or until the sweet potatoes are soft
Add the cress and simmer for a further 10 minutes
Use an immersion blender to blend the soup until completely smooth
4 servings
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.