1.) SUSHI RICE: RINSE rice well with cold water. In saucepan, BRING rice and 2 cups water to boil. REDUCE heat, COVER and SIMMER for about 20 minutes or until water is absorbed. LET stand for 10 minutes.
2.) HEAT vinegar in small saucepan set over medium heat. ADD sugar and salt; SIMMER and STIR until dissolved. DRIZZLE over rice. SPRINKLE with toasted sesame seeds; TOSS well. LET cool.
3.) ASSEMBLE rice, avocados, smoked salmon, eggs and cucumber in Bento box.
4.) SERVE with soy sauce, wasabi and pickled ginger, if desired.