Sushi Chef Sushi Rice Is Premium, M401, Medium Grain Rice That Has Been Crafted For Sushi And A Variety Of Other Rice Dishes. This Particular Strain Of Rice Was Developed As An Improvement Over Other Varieties Of Medium Grain Rice. It Has A Slightly Larger Kernel And A Creamier Center, Both Of Which Lend Sushi Chef Rice Its Pleasing Texture And Slightly Sweet Taste. Premium Rice Also Has A Longer Maturing Cycle And Lower Yield Than Other Rice. Because It Is So Difficult To Grow, This Rice Is Highly Prized.