Wash the okra and trim the stem to 1/4-inch. Place 1 chile, 1/2 teaspoon mustard seeds, 3 sprigs of dill, 1 clove of garlic and 1/4 teaspoon peppercorns in the bottom of each of 4 sterilized pint canning jars. Divide the okra evenly among the 4 jars, Pack the okra in the jars, alternating stem-side-up and stem-side-down to allow you to pack the okra well into the jars. The top of the okra should come between an inch to 1/2 an inch from the rim of the jar.
In a medium saucepan over medium heat, bring the salt, vinegar and water to a boil. Once boiling, pour this mixture over the okra in the jars.
Pour the hot vinegar mixture over the jars, up to 1/4-inch from the rim of the jars. Run a thin knife between the okra and the jars to dislodge any obvious air bubbles. Okra is filled with air, so while you run the knife between the okra and the jars, air bubbles will be released from within the okra as well. If the top level of the pickling liquid lowers while you do this, just top off with more of the pickling liquid. If for any reason you don't have enough pickling liquid for all the jars, just add equal amounts of cider vinegar and water. No need to heat first, the liquid will get boiled in the hot water bath.
Wipe the rims with a clean damp towel. Place sterilized lids on jars. Screw on the the lids, firmly, but not too tight.
Place packed jars back in the pot with water you used to sterilize the jars. The water should still be hot. Because you are putting back in full jars, rather than empty jars, some water will be displaced. Allow for 1 to 2 inches of water to cover the jars. Beyond that you may want to remove excess water. Bring to a boil and process for 15 minutes. Remove to towel lined counter or to a rack (you want to avoid putting a hot jar on a cold surface, or else the jar might crack.).
10 As the jars cool, you should hear a popping sound as the vacuum created by the cooling air in the jars pulls the lid down and seals the jars. A properly sealed jar can last in a cool closet out of direct sun for about a year. If any jars do not seal, store them chilled in the refrigerator. Opened jars should last one to two months in the refrigerator.