Rinse fresh turmeric roots thoroughly under cool water to clean. Scrub if needed. Remove any roots, leaves or sprouts.

Chop turmeric into 1-2 inch chunks. Peeling is optional.

Slice turmeric into very thin pieces, about 1/8 inch thick. Thinner is better. Use a mandoline, food processor or sharp knife.

Dehydrate slices at 95°F to 115°F until completely dried and brittle. Use a dehydrator or low oven with door propped open.

Grind dried turmeric into powder using a spice or coffee grinder. Work in small batches. Sift out chunks and re-grind if needed.

Store freshly ground powder in an airtight container in a cool, dark place. Keeps for up to 1 year.