California Roll

Name: California Roll
Ingredients: Two 0.6-ounce cans crabmeat, drained; 1/2 Cup Japanese mayonnaise; 1/2 English cucumber; 9 nori sheets; 2 avocados; Juice of 1/2 lemon; 1/4 Cup water; 2 Teaspoons distilled white vinegar; 9 Cups cooked sushi rice; 1/4 Cup white sesame seeds; Wasabi, for serving; Pickled sushi ginger, for serving; Ikura (salmon roe), for garnish (optional); Tobiko (flying fish roe), for garnish (optional)