Pour rice in sieve and rinse under cold water for 30 seconds and let water drain. Do this step 4 times.
3 cups sushi rice
Put rinsed rice in rice cooker. Add water and cook rice according to equipment's instructions (may just be a "white rice" button)
3 cups water
While rice is cooking, blend rice, sugar and salt together in small bowl and stire to dissolve.
1/3 cup rice vinegar, 1/3 cup sugar, 3 tablespoons sea salt
Once rice is done cooking place in large bowl (allow to cool slightly if too hot to handle). Sprinkle vinegar mixture over rice a bit at a time, stirring rice to incorporate. You want the rice to still be warm.
Spray round forms with a bit of cooking spray to help reduce sticking. You may wipe some off if too much.
Place round form on parchment lined baking tray. Place abut 1/4 cup of warm rice into middle of form and gently press down. You may use a round cup that is just smaller than the form to apply even pressure. Do not over press, you want a nice circular patty that stays together.
Gently lift form while pressing down on rice patty to release.
Regrease form and move to another section of tray. Repeat process until all the patties are made.
Use immediately or store in refrigerator in an airtight container (you can use plastic food wrap between patties to enable you to stack them.