Wash the asparagus. Peel white asparagus, cut off woody ends. Cut the woody ends off the green asparagus. Put white asparagus in boiling salted water and cook for about 18 minutes. After about 6 minutes add the green asparagus and cook to the end. Pour carefully into a sieve and drain well.
In the meantime, wash the basil, dab dry and pluck the leaves from the stalks. Put basil and olive oil into a tall mixing bowl and puree. Mix vinegar, salt, sugar, pepper and mustard with the whisk of the hand mixer. Allow the basil oil to run in and fold in. Mix drained asparagus and marinade. Cover and leave to stand for about 1 hour. In the meantime clean and wash the spring onions and cut them into rings. Clean, wash and halve the tomatoes. Peel garlic and chop finely. Wash the prawns and dab them dry. Heat the oil in a pan, add the prawns and fry them for 3-4 minutes while turning. Add garlic shortly before the end of the frying time.
Clean, wash and halve the tomatoes. Peel garlic and chop finely. Wash the prawns and dab them dry. Heat the oil in a pan, add the prawns and fry them for 3-4 minutes while turning. Add garlic shortly before the end of the frying time. Season with salt, pepper and lemon juice. Mix asparagus, tomatoes, spring onions and prawns. Serve on a plate garnished with basil if you like
Waiting time approx. 1 hour