Heat the oil in a saucepan over a medium heat.
Add the onion and garlic and fry for 3–4 minutes, until softened.
Add the frozen peas and stock. Bring to the boil, then reduce the heat and simmer for 10 minutes.
Add the cream.
Blend the soup until smooth (use a stick blender, food processor or blender).
Season to taste and serve in a warm bowl, garnished with mint (if using) or a swirl of cream.
