Caramelized Onion and Horseradish Mashed Potatoes

Ingredients

• 1 tablespoon white balsamic vinegar (optional)
• ½ cup whole milk
• 1 tablespoon light mayonnaise
• 2 tablespoons prepared horseradish
• 1 tablespoon fresh lemon juice
• 2 teaspoons brown sugar
• ¼ cup Dijon mustard
• + 4 more ingredients
• • ¼ cup butter, divided
  • ½ teaspoon salt
  • 2 ½ pounds cubed peeled baking potato
  • 4 cups chopped onion

Melt 1 tablespoon butter in a medium nonstick skillet over medium-high heat. Add onion and sugar; sauté 10 minutes or until caramelized. Remove from heat; stir in vinegar, if desired. Place potato in a saucepan, and cover with water. Bring to a boil. Reduce heat; simmer 15 minutes or until tender...

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