Onions peel and in small cubes cut. Clean, wash and cut the celery into small pieces. Peel and chop garlic. Wash the asparagus, cut off the woody ends. Cut the asparagus into small pieces.
Heat the oil in a pot. Fry the onions, garlic and celery for 5-6 minutes while stirring. Add peas and asparagus and steam for 1-2 minutes. Add stock, bring to the boil and simmer at medium temperature for about 10 minutes.
Put the soup into a universal blender and puree very finely. Then, if necessary, pass through a sieve. Put the soup back into the pot and heat up again. Season to taste with lemon juice, salt and pepper.
Wash the dill, shake dry, pluck the flags and cut into large pieces. Arrange soup in bowls. Put 1 blob of crème fraîche on each bowl and sprinkle with black pepper, garnish with dill.