2cupsapple cider vinegar or white distilled vinegar
Instructions
Combine 4 cups diced cucumbers, 2 cups diced yellow or white onions, 1 cup diced green bell pepper, and 1 cup diced red bell pepper in a large bowl. Sprinkle ¼ cup pickling salt over vegetables, and then add cold water until the vegetables are just covered. Let stand for 2 hours at room temperature.
Prepare canner, jars, and lids. (See Canning 101 for more information)
Drain vegetables in a colander, then rinse the vegetables under cold water.
Combine 3 ½ cups granulated sugar, 1 tablespoon celery seed, 1 tablespoon whole mustard seed, and 2 cups apple cider vinegar or white distilled vinegar in a large saucepan over medium-high heat. Bring to a simmer, then add the vegetables and simmer for 10 minutes.
Pack hot relish into hot jars, leaving ½ inch headspace. Remove air bubbles, wipe jar rim, then center lid and screw on ring until fingertip-tight. Place jar in simmering water bath canner. Repeat with remaining jars and relish.
Process for 10 minutes. Turn off heat and remove cover, and let jars rest in the canner for 5 minutes. Then remove jars to a towel or cutting board to cool for 12 hours. Do not retighten rings. Check for seal, label and store.