1⁄4 l ice cold water with 1 teaspoon salt, flour and starch. Stir in egg. Cover the dough and chill for about 30 minutes.
Wash and peel the asparagus and cut off the woody ends. Cut the asparagus spears in half lengthwise and crosswise.
Mix mayonnaise and asia sauce for the dip. Season to taste with salt, cayenne pepper and lemon juice.
Heat the oil in a deep fryer or in a wide pot to approx. 180 °C. Pull asparagus spears individually through the dough and fry them in the hot oil for 2-3 minutes. Drain well on kitchen paper. Arrange asparagus tempura on salad leaves.
Serve the Asiadip with it. Garnish with lemon and parsley.