Step 1: In a fine-mesh strainer, rinse rice under cool water until water runs almost clear. Transfer to a rice cooker or medium pot. Add 1 1/2 cups water.
Step 2: If using a rice cooker, cook according to manufacturer’s instructions. If cooking on the stovetop, bring to a boil, then immediately reduce heat to lowest setting. Cover and cook 15 minutes, then remove from heat. Let rice absorb residual moisture, still covered, about 10 minutes.
Step 3: Meanwhile, in a small saucepan over medium heat, whisk vinegar, granulated sugar, and salt. Cook, whisking, until sugar and salt dissolve. Remove from heat.
Step 4: Fluff rice with a rice paddle or rubber spatula. Transfer to a large baking dish or rimmed baking sheet. Add vinegar mixture a few tablespoons at a time, using paddle to gently fold into rice without breaking any grains, until rice has reached your desired level of seasoning.
Step 5Let cool until slightly warmer than room temperature.