Pick nasturtium seeds from nasturtium plants in spring or summer.
Place nasturtium seeds into a bowl of cold water and swirl them around to remove dirt and debris. The dried stems and flowers will float to the surface.
Add clean pods to an 8-ounce pickling jar. Fill a small saucepan with water, vinegar, salt, and sugar, and bring to a boil. Add a few sprigs of fresh dill to the jar, then pour pickling solution over the pods.
Seal and place in a dark, cool, spot. Allow to pickle for at least one to two weeks. Store in the refrigerator after that.
Notes
If you think you might find the flavor too strong, brine the seeds in a mixture of two cups water and ¼ cup salt for 3 to 5 days. Rinse the seeds and continue with the recipe steps.
The extra brining time mellows out the flavor, but I personally prefer the strong flavor.
Pickle the nasturtium seeds for at least 2 weeks, longer would be even better.
Store pickled nasturtium seeds in the refrigerator for up to 6 months.
If pressure canning, pickled nasturtium seeds can be stored in a cool, dark location for up to a year.