Prep the workspace: Turmeric stains. Line your cutting board with parchment, wear gloves, and use a knife you don’t mind getting yellow.

Wash and trim: Rinse rhizomes under cool water. Scrub off dirt, then trim off any soft or bruised spots and cut away knobby ends.

Peel or don’t peel: Peeling is optional. The skin is thin and edible. If you want the brightest color and smoothest powder, peel with a spoon. If not, just scrub well.

Slice evenly: Cut into 1/8-inch (3 mm) slices. Thinner slices dry faster and more evenly. Aim for uniform thickness to prevent under- or over-drying.

Choose your drying method: Dehydrator: Arrange slices in a single layer on trays. Dry at 105–115°F (40–46°C) for 6–10 hours, or until crisp and brittle.

Oven: Line baking sheets and spread slices in a single layer. Set oven to the lowest temp (ideally 150–170°F / 65–75°C). Prop the door slightly open with a wooden spoon for airflow. Dry 3–5 hours, flipping halfway, until completely brittle.

Check for doneness: A properly dried slice should snap cleanly. If it bends or feels leathery, keep drying.

Cool completely: Let the slices sit at room temperature for 20–30 minutes. Trapped warmth can cause condensation in your grinder or jar.

Grind: Use a spice grinder, high-speed blender, or clean coffee grinder. Work in small batches for a fine, even powder. Pulse until you reach your desired texture.

Optional blend-ins: For a ready-to-use mix, grind 1 teaspoon black peppercorns per cup of turmeric powder and blend together. Pepper can enhance turmeric’s benefits in recipes that include fat.

Sift and regrind: Pass the powder through a fine sieve. Return larger bits to the grinder until everything is uniform.

Jar and label: Transfer to an airtight glass jar. Label with the date and note “homemade” so you remember it’s extra potent.