01 - Melt the butter in a large saucepan over medium heat. Add the onion and sauté for 3 to 4 minutes until softened but not browned.
02 - Add the garlic and cook for 1 minute, stirring constantly.
03 - Stir in the green peas and vegetable stock. Bring to a gentle boil, then reduce heat and simmer for 8 to 10 minutes until the peas are tender.
04 - Remove the saucepan from the heat and add the mint leaves.
05 - Blend the soup using a stick blender or in batches in a countertop blender until smooth.
06 - Return the soup to the pan, stir in the cream if using, and season to taste with salt and pepper. Gently reheat if needed, but do not boil.
07 - Ladle into bowls, garnish with extra mint leaves and a swirl of cream if desired. Serve hot.