Mom'S Pepper Relish
["2 doz. sweet red bell peppers", "7 medium onions", "2 Tbsp. mustard seed", "2 Tbsp. salt", "3 c. apple cider vinegar", "3 c. sugar"]
["Remove\tstems and seeds from bell peppers.", "Peel onions and quarter.", "Grind peppers and onions, saving juice.", "Combine with remaining", "ingredients", "and", "boil 30 minutes.", "Stir frequently. Pack in jars and seal."]
["sweet red bell peppers", "onions", "salt", "apple cider vinegar", "sugar"]