Heat the vegetable oil in a large pan on a medium heat
Add the onion and garlic, cook for around 5 minutes, until soft
Add the water, sweet potato and vegetable stock and bring to the boil
Boil for 15-20 minutes until the sweet potatoes are soft
Remove from the heat and use a stick blender to puree the mixture
Add the double cream and salt, and stir in. You can also add more water at this point if you want a thinner soup
Serve immediately, or allow to cool fully and store in the fridge in an airtight container for 2-3 days. Or in the freezer for up to 3 months
Notes
This recipe is made using the jewel sweet potatoes which have an orange flesh, as they are the most commonly available type in the UK where I am based. Garnet sweet potatoes would also work well for this recipe.
Although I provide cup measurements, I highly recommend weighing your ingredients out using digital kitchen scales. It is the most accurate way to measure ingredients and will ensure the best results. Digital scales are very low cost and can be purchased for around £12 ($16.50) .
For teaspoon (tsp) and tablespoon (tbsp) measurements, please use measuring spoons and not the type of spoons you eat with. Again this will ensure accuracy and provide the best results.