Combine mustard, 3 cups vinegar, sugar and peppers in a Dutch oven. Bring to a boil over medium heat, stirring constantly. Mix cornstarch with remaining vinegar; slowly stir into mustard mixture. Cook and stir until thickened. Remove from heat and pour into hot sterilized jars, leaving 1/2-inch headspace. Wipe rims; secure with lids and rings. Process for 10 minutes in a boiling water bath. Set jars on a towel to cool; check for seals.
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