Shrimp Sushi Bowls

Name: Shrimp Sushi Bowls
Ingredients: 2 cups sushi rice (cooked according to packaging directions); 4 tbsp rice vinegar; 2 tbsp sugar; 1/2 tsp salt; 1/4 cup mayonaise; 1 1/2 tbsp sriracha; 10 oz shrimp (cooked, peeled, and chopped); 1 1/2 cup diced cucumber; 3/4 cup matchstick carrots; 1 nori sheet; 1 1/2 tbsp pickled ginger (sushi style, chopped); 1 avocado (peeled, pitted, diced); black sesame seeds (for garnish); 1 tbsp rice vinegar; 1/4 cup reduced sodium tamari (can sub coconut aminos if avoiding soy)