Peel the eggs and chop finely. Drain tuna fish and crumble coarse. Remove seeds of the tomatoes and dice finely. Mix well eggs, tuna, tomatoes, mayonnaise, sour cream and lemon juice. Season with salt, pepper and a dash of Worcester sauce.
Wash and dry the rocket salad. Cover roast beef slices with tuna and with rocket leaves and roll up. Serve with the remaining rocket salad.