Wash the asparagus, cut off the woody ends. Boil up plenty of water with 1-2 teaspoons of salt, approx. 1 teaspoon of sugar and 1 tablespoon of lemon juice in a large pot. Pre-cook the asparagus in boiling water for about 3 minutes, remove and rinse.
In the meantime, wash, clean, quarter and seed the tomatoes. Cut the flesh into small cubes. ##leek## onion clean, wash and cut into fine strips. Cut ##mango## from the stone, peel and dice finely.
Mix mango, tomato cubes and spring onion. Mix together 3 tbsp. lemon juice, 2 tbsp. oil and ketchup and stir in. Season to taste with salt, pepper and sugar. Dab meat dry. Heat 2 tablespoons of oil in a frying pan.
Fry the steaks for about 3 minutes on each side, season with salt and pepper and remove from the pan. Wrap in aluminium foil and let it rest for about 3 minutes. Heat 1 tablespoon of oil in a frying pan. Fry the asparagus while turning for about 3 minutes, season with salt and pepper, remove from the pan.
Arrange rump steaks and asparagus spears on plates. Add tomato-mango salsa.