Surprise your partner with homemade heart-shaped sushi rolls for a unique and creative Valentine's Day dinner. Prepare sushi rice and let it cool. Lay a sheet of nori on a bamboo sushi mat and spread a thin layer of rice on top, leaving a small border. Add your desired fillings, such as avocado, cucumber, and cooked shrimp, in the center. Roll the sushi tightly using the bamboo mat and shape it into a heart. Slice the roll into individual heart-shaped pieces. Serve with soy sauce and wasabi for a romantic and delicious sushi experience.