01 - Melt butter in a large saucepan over medium heat. Add chopped onion and cook for 4–5 minutes until softened but not browned.
02 - Stir in minced garlic and cook for 1 minute, stirring frequently to prevent burning.
03 - Add peas to the pan and cook for 2 minutes, stirring occasionally.
04 - Pour in vegetable broth and bring to a simmer. Cook for 8–10 minutes until peas are completely tender.
05 - Remove from heat. Stir in fresh mint leaves and let stand for 2 minutes to allow flavors to meld.
06 - Using an immersion blender, purée the soup until completely smooth and silky. Alternatively, blend in batches in a countertop blender.
07 - Return soup to pan if removed. Stir in milk and crème fraîche. Gently reheat over low heat without boiling. Season with salt and pepper to taste.
08 - Ladle soup into bowls. Create a swirl of extra crème fraîche on top and garnish with fresh mint leaves and a grind of black pepper.