Roast sesame seeds in a pan without fat. Remove. Cut bread into small cubes. Heat 1 tablespoon of oil in a frying pan. Fry the bread cubes for 2-3 minutes until crispy. Drain on kitchen paper.
Wash and clean the cucumber and cut in half lengthwise. Seed the cucumber with a teaspoon. Peel carrots. Grate carrots and cucumber separately. Squeeze the cucumber a little. Halve avocado and remove stone. Remove the flesh from the skin and cut into thin slices.
Sprinkle with 1 tablespoon lime juice.
Mix yoghurt with 3 tbsp lime juice and wasabi paste. Fold in 2 tablespoons of oil. Season with salt, pepper and 1 pinch of sugar. Cut roast beef slices in half. Mix the grated cucumber and carrot with half the dressing.
Arrange the avocado slices in a fan-like fashion. Add carrot-cucumber salad, roast beef and bread cubes. Sprinkle with sesame seeds. Drizzle with the remaining dressing. Cut the cress from the bed and sprinkle over it.