Place crab in sieve; pick through and remove any cartilage. Gently squeeze out any excess moisture; set aside. In small bowl, stir wasabi powder with 1 ½ tsp (7 mL) water until a smooth paste is created; let stand for 5 minutes.
In large bowl, stir mayonnaise, soy sauce, sesame oil and wasabi paste until smooth. Stir in sweet pepper, baby corn, celery and green onion.
Halve and pit avocados; using small spoon, scoop out most of the flesh, leaving about 1/2-inch intact along edge. Mash flesh in bowl; stir into wasabi mix. Fold in crab.
Divide greens among 4 plates; top with avocado shells, cut side up. Divide and spoon crab mixture into each shell. Sprinkle with sesame seeds.
Nutrients per serving: 304 calories, 14 g protein, 24 g fat (4 g saturated fat), 11 g carbohydrates (6 g fibre), 56 mg cholesterol, 399 mg sodium