Put honeoy, vinegar, sugar, eggs and flour into blender a few seconds to blend at high speed until smooth. Transfer to a 2-quart saucepan. Cook on medium high whipping briskly with whisk to prevent it from sticking to bottom of pan. It will thicken just as it comes to a boil. Quickly add mustard and whiskey. Continue to cook and stir briskly only 1/2 minute. Remove from heat. Add the horseradish. Beat well. Cool completely. Bottle and cap tightly. Can store refrigerated 6-8 weeks. Freezes for months. Recipe can be halved.