Rinse the rice under cold water until the water runs clear. Drain well.
In a pot, bring the rice, water and salt to a boil. Cover and cook over low heat for 15 minutes or until the water has been completely absorbed by the rice. Remove from the heat and let sit, covered, for 10 minutes. Remove the lid and fluff the rice with a fork. Let cool (see note).
In a bowl, combine all of the ingredients.
Divide the rice among four bowls. Top with the shrimp and some of the marinade. Garnish with the vegetables and mango. Serve with the spicy mayonnaise. Sprinkle with the tempura and sesame seeds, to taste.
You can also cook the rice in a rice cooker according to the manufacturer’s instructions.