Place nectarine pieces in a quart jar (or divide into two pint jars) and press down lightly with a wooden mallet.
Mix salt, Sucanat, and whey and then pour over the jar (or divide by two jars).
Add filtered water to bring the liquid to the top of the fruit. Leave at least one inch from top of fruit to top of jar.
Cover tightly and keep at room temperature for two days, burping at least one time per day, before moving to cold storage.
When ready to use, ladle the syrup off for a thin syrup or mash the fruit lightly for a thicker syrup.