1. Peel the sweet potato and chop into pieces
2. Peel the onion and garlic. Chop the bottom off the onion
3. Place the sweet potato, onion and garlic into a large pot
4. Cover with water, making sure the ingredients are completely submerged
5. Cover with a lid and turn the heat to high. Bring to the boil
6. Remove the lid and continue to boil for approximately 20 minutes or until you can poke the sweet potato with a knife and it feels soft.
7. Drain the water from the pan
8. Open the tin of butter beans, drain the thick liquid and wash the beans thoroughly with running water
9. Add the butter beans to the pan with the olive oil and salt
10. Throw all ingredients into a blender or use a stick blender to blend until smooth.
11. Blend until smooth and serve with cracked pepper
12. Use any left-over mash to create a soup

Serves 4