Mix yoghurt and salad cream. Season to taste with salt and pepper. Wash the tomato, grate dry and cut into quarters. Remove seeds, cut flesh into fine cubes. Remove the avovado pulp from the skin and dice finely.
Sprinkle with 1 tablespoon of lemon juice. Add avocado and tomato cubes to the yoghurt mixture and fold in carefully. Cover and chill. In the meantime peel and finely dice the shallot. Mix vinegar and diced shallots.
Season with salt, pepper and 1 pinch of sugar. Gradually fold in 2 tablespoons of olive oil. Wash the salad and spin dry. Mix salad and vinaigrette. Peel the prawns, except for the tail fin, and remove the intestines.
Wash the shrimps and pat them dry. Sprinkle prawns with 1 tablespoon of lemon juice. Heat 1 tablespoon of oil in a frying pan and fry the prawns for about 4 minutes, turning them over. Arrange salad and prawns together.
Add remoulade.