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["Cut off the blossom end of each cucumber; cut into 1/4-inch rounds.", "Cut the onions in half lengthwise and thinly slice them into half circles.", "Put the cucumbers and onions into a large bowl and sprinkle with 1/4 cup of kosher salt, tossing to combine. Cover with a layer of ice cubes and refrigerate for 8 hours or overnight.", "Pick out any unmelted ice, drain well, and rinse under cold running water. Toss with the mustard seeds, celery seeds, and red pepper flakes and set aside.", "In a non-reactive pot, combine the vinegar, 1 and 1/2 cups water, the honey, turmeric, mustard powder, and the remaining 1 tablespoon kosher salt. If pasteurizing, bring the mixture to 160u00b0 to 180u00b0 on a candy thermometer. If processing, bring to a full boil.", "Working quickly, pack the cucumbers and onions into the jars (not too tightly), leaving 1"" headspace. Ladle the hot vinegar mixture into the jars, leaving 1/2"" headspace at the top. Use a chopstick to remove air bubbles around the inside of each jar. Use a damp paper towel to wipe the rim of each jar to remove any brine which may have gotten on the rim, then put a flat lid and ring on each jar, adjusting the ring so that it's just finger-tight. Place the jars in the water bath, making sure they are covered by at least 1"" of water.", "If pasteurizing, bring the water in the pot to 180u00b0F, and keep it there, adjusting the burner as necessary, for 30 minutes (use a candy thermometer to monitor the temperature). Any time the water spends below 180u00b0F must be added to the pasteurizing time so that the water is at 180u00b0F for a total of 30 minutes.", "If processing, bring to a full boil and process for 15 minutes.", "Remove the jars from the water bath, place on a folded towel, and do not disturb for 12 hours.", "Check that the lids have sealed by pressing down on the center of each; if it can be pushed down, it hasn't sealed, and the jar should be refrigerated immediately. Label the sealed jars and store."]
