Slice 3 potatoes into a large pot that has enough water to cover the potatoes and some extra space for potatoes to boil. Place over medium heat and bring to a boil. Reduce heat to low, and cook for about 20 minutes. Use a fork to test whether the potatoes are tender. They should crumble easily, but not be mushy. Drain the potatoes through a colander into the sink. Return potatoes to original pot. Add 1 teaspoon salt, 1/4 cup butter, 1 tablespoon creamy horseradish sauce, and beat with an electric mixer until combined thoroughly. Add 1/2 cup milk, and continue to beat, until potatoes are fluffy. Spoon whipped potatoes into a nice serving bowl. Place 1 tablespoon butter on top to drizzle down, and snip some fresh chives over the top. Serve immediately. These Horseradish Whipped Potatoes give a little personality to ordinary whipped potatoes, and they are good with meatloaf, steak, chicken, fish, pork chops--just about anything! Enjoy!!!