Veggie Sushi Rolls

Name: Veggie Sushi Rolls
Ingredients: 1 1/2 cups dry sushi rice; 1 3/4 cups water; 2 tablespoons seasoned rice vinegar; 2 tablespoons agave nectar; 1/2 cup apple cider vinegar; 1 cup water; 1 1/2 teaspoons salt; 1/4 cup sugar; 1 cup shredded carrots; 3 to 4 nori sheets; 1 Haas avocado (sliced into long, narrow pieces); 1/2 cucumber (seeded and sliced into long, skinny pieces); 3 tablespoons panko (or more, to taste. Gluten-free is OK!); 2 to 3 green onions (sliced into long, skinny pieces)