Wash the beetroot and remove the stalks.
Use a mandolin on a thin slice setting to slice the beetroot into rounds.
Place the beetroot in a plastic bag with oil, salts and rosemary if using.
Work the oil and salt around beetroot until the beets are coated.
Place beetroot in a single layer in the dehydrator racks.
Set dehydrator according to the manufacturers instructions.
When ready taste and season as required. Serve with dip or on their own.