01 - Melt the butter in a large saucepan over medium heat. Add the chopped onion and sauté for 4–5 minutes until soft and translucent.
02 - Add the minced garlic and cook for 1 minute, stirring frequently.
03 - Stir in the peas and vegetable broth. Bring to a gentle boil, then reduce heat and simmer for 8–10 minutes (5–6 minutes if using fresh peas), until peas are tender and bright green.
04 - Remove from heat. Add mint leaves, salt, pepper, lemon zest, and lemon juice. Purée the soup using an immersion blender or carefully in batches with a countertop blender until silky smooth.
05 - Stir in the crème fraîche until fully incorporated. Taste and adjust seasoning if needed.
06 - Ladle the soup into bowls. Garnish with a dollop of crème fraîche and extra mint leaves.