Nobu’s Spicy Tuna Crispy Rice 🍣😍 #Nobu #Sushi #sashimi

1 cup short-grain Japanese rice
1 tablespoon sesame oil
1/2 cup water
1/2 teaspoon salt
1 avocado, sliced
1 tablespoon spicy mayo
1/2 teaspoon sesame seeds
For the spicy tuna:

225g / 7oz sashimi grade tuna, or salmon
1 tablespoon sriracha, adjust spiciness to taste
4 tsp kewpie mayonnaise
1 tsp sesame oil
1/4 tsp cooking salt
2 tbsp finely chopped green onion
1 tsp white sesame seeds
1/2 tsp black sesame seeds, divided