• Gather all ingredients. Preheat the oven to 300 degrees F (150 degrees C).
• Bring water to a boil in a medium pot; stir in rice. Reduce heat to medium-low, cover, and simmer until rice is tender and water has been absorbed, 20 to 25 minutes.
• Mix rice vinegar, sugar, and salt in a small bowl. Gently stir into cooked rice in the pot and set aside.
• Lay nori sheets on a baking sheet.
• Heat nori in the preheated oven until warm, 1 to 2 minutes.
• Center 1 nori sheet on a bamboo sushi mat. Use wet hands to spread a thin layer of rice on top. Arrange 1/4 of the crabmeat, avocado, cucumber, and pickled ginger over rice in a line down the center.
• Lift one end of the mat and roll it tightly over filling to make a complete roll.
• Repeat with remaining ingredients.Use a wet, sharp knife to cut each roll into 4 to 6 slices.

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