Easy Sushi Cupcakes

Name: Easy Sushi Cupcakes
Ingredients: 2 cups cooked sushi rice; 2 tablespoons rice vinegar; 1 tablespoons sugar; ½ teaspoon salt; 12 nori sheets; 6 teaspoons hoisin sauce; black sesame seeds (for sprinkling); pickled ginger (to serve); soy sauce (to serve); wasabi (to serve, optional); 1 red pepper (thinly sliced); 1 carrot (julienned); ½ cucumber (julienned); 1 small avocado (thinly sliced); 10 fresh chives (sliced); 2 radishes (thinly sliced); 2 tablespoons sriracha (adjust to taste); ¼ cup vegan mayonnaise