To toast sesame seed, cook in skillet over medium-low heat 5 to 7 minutes, stirring frequently until browning begins, then stirring constantly until golden brown. Remove immediately from skillet to prevent seed from continuing to cook and get overdone.
Vary the vegetable toppings with sliced radishes, asparagus cuts or sliced green onions.
Seasoned rice vinegar contains salt and sugar to flavor the sushi. In this recipe, you can make your own from rice vinegar by stirring in 2 teaspoons sugar and 1/4 teaspoon salt.