Clean, wash and cut the cabbage into strips. Blanch cabbage briefly in boiling salted water, rinse under cold water and drain. Cut bacon into small cubes. Clean, wash and halve the tomatoes.
Wash the chives. Leave bacon in a pan until crispy. Remove the bacon cubes. Deglaze frying fat with vinegar, lemon juice and 2 tablespoons of water. Season with salt, pepper and sugar. Add chives.
Rinse off the crabs. Mix cabbage, tomatoes, bacon and prawns. Add the vinaigrette and let it soak through a little. If necessary, season again with salt and pepper. Garnish with parsley.