Peel and cut the daikon into sticks about 3 inches long and 0.25 inches thick, the width of an average chopstick. Peel and cut the carrot to match the size of the daikon sticks but slightly skinnier. Put the vegetables in a bowl. Toss with the salt and 2 teaspoons of the sugar. Massage and knead the vegetables for 3 minutes, or until you can bend a piece of daikon and the tips touch without breaking. They will have lost about a quarter of their original volume.