Wash the okra thoroughly under cold water and dry each pod carefully with a clean towel to remove excess moisture before pickling.
Trim the stem ends lightly, being careful not to cut too deeply into the pods because this can release more natural sliminess.
Place garlic cloves, dill sprigs, mustard seeds, peppercorns, and chili flakes into clean glass jars to create the seasoning base.
Pack the okra vertically into the jars, arranging the pods tightly while leaving enough room for the vinegar solution.
Heat vinegar, water, salt, and sugar in a saucepan over medium heat until the salt and sugar dissolve completely.
Pour the warm brine over the okra until all pods are fully submerged, then allow the jars to cool before sealing.
Store the jars in the refrigerator and let them rest for at least one day, though three days will create a deeper garlic and dill flavor.