Place the rice in a strainer and rinse the rice until the water runs clear. Use your hands to be sure all the grains are rinsed well. Place the rinsed rice into a medium pan with the 2 cups of water over high heat. Once the water begins to boil, cover the pot and reduce the heat to the very lowest setting. Cook for 15 minutes. Once the rice has finished cooking, remove from the heat, leave the lid on and let it sit for another 10 minutes.
Combine the vinegar, sugar and kosher salt in a small microwave safe cup and microwave for 30 seconds. Once the rice has sat for 10 minutes, toss it well with the seasoning liquid. Allow the rice to come to room temperature before using. Store leftover rice in the fridge in an airtight container for up to one week.