Peel onion and garlic. Chop the onion finely, press the garlic through a garlic press. Remove the seeds from the chilli and chop finely. Peel ginger and dice finely. Wash the coriander, dab dry and chop finely, except for a little bit for garnishing.
Wash the prawns, remove the intestines and chop them. Mix Mt egg, garlic, ginger, chilli, coriander and half of the onions. Spread the shrimp paste on 4 slices of toast bread and quarter them diagonally (= triangles).
Clean and wash the cucumber and cut it diagonally into large slices. Mix lime juice, soy sauce, remaining onion cubes, some salt, pepper and sugar. Add 3 tablespoons of oil. Mix the cucumber slices with the vinaigrette.
Heat 3 tablespoons of oil in a frying pan and place the croutons in the hot oil with the coated side first. Fry for 2-3 minutes, turning them over, until golden brown. Place 2 croutons on each wooden skewer.
Arrange cucumber salad with warm crab croutons. Serve with Asian sauce.