01 - Melt 2 tablespoons of unsalted butter in a large saucepan over medium heat. Add the finely chopped onion and sauté for 3 to 4 minutes until softened but not browned.
02 - Incorporate the minced garlic and cook for 1 minute, stirring continuously to prevent burning.
03 - Stir in the 3½ cups of green peas and 3 cups of vegetable stock. Bring the mixture to a gentle boil, then reduce the heat and let it simmer for 8 to 10 minutes, or until the peas are tender.
04 - Remove the saucepan from the heat and stir in the small bunch of fresh mint leaves.
05 - Using a stick blender directly in the saucepan or transferring in batches to a countertop blender, process the soup until it achieves a smooth consistency.
06 - Return the blended soup to the pan. If desired, stir in ¼ cup of double cream or crème fraîche. Season the soup to taste with salt and freshly ground black pepper. Gently reheat if necessary, taking care not to bring it to a boil.
07 - Ladle the hot soup into individual bowls. Garnish with additional fresh mint leaves and an extra swirl of cream if preferred. Serve immediately.