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Caramelized Onion and Horseradish Smashed Potatoes

By: brightlightz

"Caramelized onions give this incredible side dish a subtle sweetness, and the addition of horseradish gives it a little attitude! They make an absolutely fabulous side dish to prime rib, and have become a tradition every year at family holiday gatherings! To save time, the caramelized onions can be made ahead of time and refrigerated, then warmed before adding to the potatoes."

Rate/Review | Read Reviews (39)

Prep Time:
25 Min

Cook Time:
25 Min

Ready In:
50 Min

Servings (Help)

US Metric Calculate

Original Recipe Yield 8 servings

Ingredients

3 tablespoons butter
4 onion, sliced and separated into rings
1 tablespoon white wine vinegar
1/2 teaspoon ground dried thyme
6 large baking potatoes, peeled and cubed
1 tablespoon Dijon mustard
2 tablespoons prepared horseradish, or to taste
salt and cracked black pepper to taste
1/4 cup softened butter
3/4 cup half-and-half

Directions

Melt 3 tablespoons butter in a large skillet over medium-high heat. Add the onions and cook for 5 minutes. Reduce heat to medium, and continue cooking, stirring frequently, until the onions have softened, and achieved a deep brown color, 15 to 25 minutes. Stir in vinegar and thyme, and cook for 5 minutes more.
While the onions are cooking, place cubed potatoes in large pot and cover with salted water. Bring to a boil, then reduce heat to medium-low, cover, and simmer until the potatoes can be pierced easily with a fork, about 20 minutes. Drain the potatoes in a colander, and allow to steam for a minute.
To finish the dish, transfer the potatoes to a serving bowl, and use a potato masher to mix with Dijon mustard, horseradish, salt and cracked black pepper until smooth. Mix in softened butter, caramelized onions, and half-and-half until onions are distributed evenly.