Whisk the salt and sugar together so that they are completely combined.
Put about ¾ cup of the salt/sugar mixture at the bottom of a glass dish. Make indentations for the egg yolks in the mixture using the back of a spoon. Carefully lay the egg yolks into the indentations, being careful not to break them. Cover the eggs with the remaining salt and sugar mixture. Seal the dish and refrigerate for 5-7 days.
(Don't waste the egg whites! Make yourself an egg white omelet.)
After 5-7 days, remove the eggs from the dish. Brush off the curing mixture, gently rinse them under water and pat dry.
Heat an oven to 175 degrees. Spray a cooling rack with cooking spray and lay the yolks on top. Dry the yolks in the warm oven for 1 hour.