Instructions
Wear gloves. Avoid inhaling lime dust. Wash peppers, discard stem ends, and slice 1/4 inch thick.
Mix pickling lime with 1 1/2 gallons water in a nonreactive food-safe container. Refrigerate pepper rings in the lime water for 18 hours, stirring occasionally; 12 to 24 hours is permitted.
Drain and rinse thoroughly. Cover with fresh cold water and refrigerate 1 hour; drain. Repeat the rinse, soak, and drain sequence two more times, then drain thoroughly.
Place 1 tablespoon mustard seed and 1 1/2 teaspoons celery seed in each hot pint jar. Pack peppers, leaving 1/2-inch headspace.
Boil vinegar, 1 3/4 cups water, and salt. Cover peppers with brine, maintaining 1/2-inch headspace. Remove bubbles, wipe rims, and apply lids.
Process pints in a boiling-water canner for 10 minutes at 0–1,000 ft, 15 minutes at 1,001–6,000 ft, or 20 minutes above 6,000 ft. Cool 12 to 24 hours and check seals.