Trim the leeks. Cut off the tough dark green tops and the root end. Keep the white and light green portions. You can save the dark greens for stock if you like.

Slice evenly. Cut the leeks into thin rounds, about 1/8 to 1/4 inch thick. Even thickness helps them dry at the same rate and prevents scorching.

Wash thoroughly. Leeks hide sand. Separate the rings and swish them in a large bowl of cold water. Add a splash of lemon juice or vinegar if you want extra help loosening grit. Lift the leeks out with your hands or a strainer so the dirt stays at the bottom.

Dry before dehydrating. Spin the slices in a salad spinner or pat dry with towels. Removing surface moisture speeds up drying and improves texture.

Arrange on trays. Spread the slices in a single layer on dehydrator trays lined with mesh or parchment. Avoid overlap; crowded trays slow the process.

Set temperature. Dehydrate at 125–135°F (52–57°C). For ovens, set to the lowest temperature and prop the door slightly open for airflow if needed. Use a fan if your oven doesn’t circulate air well.

Dry until crisp. This usually takes 6–10 hours in a dehydrator, depending on slice thickness and humidity. In an oven, it may take longer. The leeks are done when they’re completely dry, brittle, and snap when bent.

Rotate trays as needed. If you notice uneven drying, rotate trays halfway through. This keeps everything consistent.

Cool and condition. Let the dried leeks cool completely. Then place them in a large jar for conditioning for 5–7 days: shake the jar daily and check for any signs of moisture or clumping. If you see it, return them to the dehydrator for another hour or two.

Store properly. Once fully dry and conditioned, transfer to airtight jars or containers. Label with the date. Keep in a cool, dark pantry.