Cut romaine lettuce into bite-sized pieces. Clean the sugar snap peas and cook in boiling salted water for about 5 minutes. Drain, rinse with cold water and let drain. Ret
Drain the crabs. Cut spring onions into fine rolls. Stir vinegar with sweet and sour sauce until smooth. Season with soy sauce and Sambal Oelek. Whip sesame oil into it. Peel the coriander leaves, chop finely and mix with the vinaigrette.
Cut the sugar snap peas lengthwise into strips and mix with romaine lettuce, radish, carrots and crabs and turn them in the vinaigrette. Arrange the salad in deep plates sprinkled with spring onions.