Balsamic Steak Tips with Horseradish Mash | America's Test Kitchen

Ingredients

• 2 pounds Yukon Gold potatoes, peeled and cut into 1-inch pieces
• 1 1/2 pounds sirloin steak tips, cut into 2-inch pieces
• Salt and pepper
• 1 tablespoon vegetable oil
• 6 tablespoons unsalted butter
• 1 shallot, chopped fine
• 1/3 cup low-sodium chicken broth
• 1/4 cup balsamic vinegar
• 1/2 teaspoon minced fresh rosemary
• 3/4 cup heavy cream
• 3 tablespoons prepared horseradish, drained