Wash the asparagus, peel and cut off the woody ends. Boil up plenty of water with 1-2 teaspoons of salt, sugar and 1 tablespoon of lemon juice in a large pot. Cook the asparagus for about 10 minutes. In the meantime peel the garlic and press it through a garlic press.
Cut the avocados in half, remove the stones. Remove the flesh from the peel and puree finely with 3-4 tbsp lemon juice and garlic. Stir in buttermilk, season to taste with salt, pepper and sugar. Stir in shrimps.
Remove the asparagus and rinse with cold water. Wash the meat, dab dry and cut lengthwise into about 5 long strips. Put the meat on wooden skewers. Heat 2-3 tablespoons of oil in a frying pan in portions.
Fry the meat skewers in portions for 4-5 minutes while turning them. Remove and keep warm. Rub grill pan with 1 tbsp. oil, heat up. Grill the asparagus spears in portions for approx. 3 minutes, turning once.
Arrange asparagus and chicken skewers on plates, add crab guacamole. Garnish with a slice of lemon.