Step 1

Dice the onion. Warm a pot/pan over a medium heat and add the butter. Once melted, add the onion and cook, stirring occasionally, for around 3-4 minutes until the onion is softened and translucent but not browning.

Step 2

Add the peas, stir to coat in the butter, then add the stock. Cover the pot with a lid and bring the mixture to a simmer. If using frozen peas, they will only need to cook around 2 minutes, if they are fresh it will be nearer 5-7 minutes. In both cases, the peas should stay bright green but be cooked.

Step 3

Remove the pot from the heat and add the roughly chopped mint. Either use a stick/hand blender or transfer the mixture to a blender and blend until smooth. Season with a little salt and pepper to taste (I only needed around 1/8tsp of each).

Step 4

Serve either warm or allow to cool and chill to serve cold. In both cases, works well with a swirl of creme fraiche in the middle of the bowl.