Mix salad cream and wasabi. Clean the salad, wash and spin dry. Wash, clean and slice the cucumber. Cut fish into 1.5 centimetre wide strips. Season with salt and pepper and turn in sesame seeds.
Heat the oil and fry the fish for four minutes while turning. In the meantime, cut open the rolls, cover the lower halves with salad and cucumber slices. Spread the fish on the rolls. Spread with wasabi cream.
Garnish with cress.