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Ultimate Steak Crostini with Creamy Horseradish Sauce and Caramelized Onions

Close-up of a perfectly prepared steak crostini topped with medium-rare steak, creamy blue cheese spread, and caramelized onions.
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Make this elegant appetizer for your next gathering. This recipe combines tender steak, sweet caramelized onions, and a zesty horseradish cream on crisp toasted baguette slices. It is a simple yet impressive finger food.

Ingredients

Scale
  • 1 pound flank steak or sirloin steak
  • 1 tablespoon olive oil, plus more for bread
  • Salt and black pepper to taste
  • 1 large yellow onion, thinly sliced
  • 1 tablespoon butter
  • 1 teaspoon sugar
  • 1/2 cup sour cream
  • 2 tablespoons prepared horseradish
  • 1 teaspoon Dijon mustard
  • 1 baguette, sliced into 1/2-inch thick rounds
  • Fresh chives, chopped, for garnish (optional)

Instructions

  1. Prepare the caramelized onions: Melt butter in a skillet over medium-low heat. Add the sliced onion and sugar. Cook slowly, stirring occasionally, for 25 to 35 minutes until the onions are deep brown and soft. Remove from heat and set aside.
  2. Prepare the horseradish cream: In a small bowl, whisk together the sour cream, prepared horseradish, and Dijon mustard. Season with salt and pepper to your taste. Cover and chill until ready to use.
  3. Cook the steak: Rub the steak with olive oil, salt, and pepper. Heat a grill or cast-iron skillet over medium-high heat. Cook the steak for 3 to 5 minutes per side for medium-rare, depending on thickness. Remove the steak from the heat and let it rest for 10 minutes before slicing thinly against the grain.
  4. Toast the crostini: Brush both sides of the baguette slices lightly with olive oil. Place them on a baking sheet. Bake at 375°F (190°C) for 8 to 10 minutes, flipping halfway, until golden brown and crisp.
  5. Assemble the appetizers: Top each toasted baguette slice with a few thin slices of steak. Spoon a small amount of the caramelized onions over the steak. Finish with a dollop of the creamy horseradish sauce.
  6. Garnish the steak crostini with chopped fresh chives, if desired, and serve immediately.

Notes

  • You can use leftover cooked steak for this recipe to make it a quick party food option.
  • For a different flavor, substitute the horseradish cream with blue cheese crumbles or a chimichurri sauce.
  • You can toast the baguette slices a day ahead of time to save time when entertaining.

Nutrition

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