Peel the onion, garlic and potato.
Chop the potato into small chunks, and finely chop the garlic and onion.
Take the mint leaves off the stem and roughly chop.
Heat the oil in a large saucepan over a medium heat.
Add the onions and cook for about 5 minutes until they turn translucent without colouring.
Mix in the chopped garlic and cook for a minute to release the flavour.
Add the chopped potatoes and stock to the saucepan.
Bring to a simmer and cook for 10 minutes with the lid on, until the potatoes are tender.
Add the peas, bicarbonate of soda and simmer for 5 more minutes.
Remove from the heat and stir in the mint, sugar and lemon juice.
Blend until smooth and return to the pan.
Add the salt and pepper to taste then transfer into bowls.
Garnish with the mint and a swirl of cream