Japanese Sushi

Name: Japanese Sushi
Cuisine: Asian, Japanese
Ingredients: 2 cups sushi rice; 2 ½ cups water; ¼ cup rice vinegar; 2 tablespoons sugar; 1 teaspoon salt; 8 oz fresh tuna or salmon (sashimi grade); 1 small cucumber, julienned; 1 avocado, sliced thinly; 4 sheets of nori (seaweed); Soy sauce, for dipping; Wasabi, to taste; Pickled ginger (gari), for serving