2Cook the Japanese short-grain rice in a rice cooker or pot according to package instructions, typically using a 1:1 ratio of rice to water. Once cooked, let it steam for 10-15 minutes without opening the lid.
3While the rice cooks, prepare the sushi vinegar: In a small saucepan, combine the Rice vinegar, Granulated sugar, and Sea salt. Heat gently over low heat, stirring until the sugar and salt are fully dissolved. Do not boil. Let the sushi vinegar cool to room temperature.