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Easy Steak Crostini with Creamy Horseradish Sauce

Close-up of several steak crostini bites topped with medium-rare steak, caramelized onions, and crumbled cheese.
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Make impressive party bites with this easy recipe for steak crostini, topped with a zesty horseradish cream and caramelized onions. This gourmet finger food is perfect for entertaining.

Ingredients

Scale
  • 1 pound beef sirloin or filet mignon steak
  • 1 tablespoon olive oil
  • 1 teaspoon kosher salt
  • 1/2 teaspoon black pepper
  • 1 baguette, sliced into 1/2-inch rounds
  • 2 tablespoons butter, melted
  • 1 large yellow onion, thinly sliced
  • 1 tablespoon balsamic vinegar
  • 1/2 cup sour cream
  • 2 tablespoons prepared horseradish
  • 1 tablespoon fresh chives, chopped

Instructions

  1. Season the steak with salt and pepper. Heat olive oil in a skillet over medium-high heat. Sear the steak for 3 to 4 minutes per side for medium-rare. Remove the steak and let it rest for 10 minutes before thinly slicing against the grain.
  2. While the steak rests, prepare the onions. Sauté the sliced onion in the same skillet over medium heat, stirring occasionally, until deeply browned and soft, about 15 to 20 minutes. Stir in the balsamic vinegar during the last minute of cooking. Set aside.
  3. Brush both sides of the baguette slices with melted butter. Toast them in the oven at 375°F (190°C) for 5 to 7 minutes, or until golden brown and crisp.
  4. Prepare the horseradish sauce by mixing the sour cream, prepared horseradish, and chopped chives in a small bowl.
  5. Assemble the steak crostini. Place a slice of rested steak on each toasted baguette round. Top the steak with a spoonful of caramelized onions.
  6. Dollop or drizzle the creamy horseradish sauce over the onions. Serve immediately as an elegant hors d’oeuvre.

Notes

  • You can prepare the caramelized onions and horseradish sauce up to one day ahead to save time when entertaining.
  • For a richer flavor, use a small amount of blue cheese crumbles on top of the steak before adding the onions.
  • If you do not have sirloin, flank steak works well for these savory bites for parties.

Nutrition

Find it online: https://rosatasty.com/steak-crostini-easy-appetizer-recipe/