Horseradish Mashed Potatoes With Caramelized Onions

Total Time: 1 hr 20 mins Preparation Time: 20 mins Cook Time: 1 hr

Ingredients

• Servings: 6
• 1/4 cup butter
• 2 1/4 lbs onions, thinly sliced
• 3 tablespoons balsamic vinegar
• 2 teaspoons fresh thyme, chopped
• 3 1/2 lbs russet potatoes, peeled, cut into 1-inch pieces
• 7 tablespoons whole milk
• 1/4 cup prepared horseradish
• 6 tablespoons butter

Recipe

• 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.