Prepare the Sushi Rice: Rinse 1 cup of sushi rice. Cook according to package instructions (18-20 minutes) and fold in 2 tablespoons of rice vinegar while warm.

Assemble Ingredients: Lay out a sushi mat covered with plastic wrap. Place a nori sheet shiny side down horizontally.

Spread Rice: With damp hands, spread a handful of rice on the nori, leaving 1 inch at the top.

Add Fillings: Lay a line of seafood and avocado along the bottom edge, customizing as desired.

Roll the Sushi: Roll the nori tightly over the fillings, sealing with water.

Cut the Roll: Slice into 6-8 pieces with a sharp, wet knife.

Serve Immediately: Arrange the rolls on a platter and serve with soy sauce, wasabi, or pickled ginger.