Horseradish Mashed Potatoes With Caramelized Onions

Total Time
1hr 20mins
Prep 20 mins
Cook 1 hr

From Bon Appetit, a nice side dish that can be made ahead. ZWT West region (Idaho potatoes).

Ingredients Nutrition

  • 14 cup butter
  • 2 14 lbs white onions, thinly sliced
  • 3 tablespoons balsamic vinegar
  • 2 teaspoons fresh thyme, chopped
  • 3 12 lbs russet potatoes, peeled, cut into 1-inch pieces
  • 7 tablespoons whole milk
  • 14 cup prepared horseradish
  • 6 tablespoons butter


  1. Melt 1/4 cup butter in large skillet over medium heat. Add onions; saute until deep golden, about 30 minutes. Add vinegar and thyme. Reduce heat to low; saute 4 minutes. Season with salt and paper.
  2. Meanwhile, cook potatoes in large pot of boiling salted water until very tender, about 20 minutes. Drain. Return to same pot; mash until smooth. Add 6 tablespoons milk, horseradish and 6 tablespoons butter; stir to blend. Thin with 2 tablespoons milk if necessary. Add 1 to 2 tablespoons more butter if necessary. Season with salt and pepper.
  3. Transfer potatoes to serving dish. Spoon onion mixture atop potatoes. (Can be prepared 8 hours ahead. Cover with foil and refrigerate. Rewarm in 350ºF oven about 30 minutes). Serve hot.


Most Helpful

Loved this recipe! We enjoyed the sweetness of the carmelized onions with the strong flavor of the horseradish! Served this with "Recipe #305341" for a totally German dinner! Also served a cucumber salad with this dinner. ZWT4.

sassafrasnanc July 02, 2008

Wonderful! Perfect amount of horseradish. I thought it would be overpowering but the taste came through without to much heat. I used 1/2 cup low fat milk and 3 pounds of potatoes that I used my ricer for fluffy tatars! Thanks!!!

Rita~ February 08, 2007

This was a nice dish that presents beautifully. Some of us liked the carmelized onions and some of us found them too sweet. Averaged out the families' ratings and came to a solid 4.

Debi June 20, 2007

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