Steak Frites with Horseradish Aioli for Two | America's Test Kitchen

Ingredients

• ¼ cup mayonnaise
• 2 tablespoons prepared horseradish
• 1 garlic clove , minced
• 1 teaspoon Dijon mustard
• 1 teaspoon minced fresh thyme
• ½ teaspoon pepper
• 1¼ pounds large Yukon Gold potato , unpeeled
• 2 cups peanut or vegetable oil for frying
• 1 (12- to 16-ounce) boneless strip steak , 1½ inches thick, trimmed
• 1 3/4 teaspoons kosher salt , divided
• 1 teaspoon pepper
• 1 tablespoon peanut or vegetable oil