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Crowd-Pleasing Steak Crostini with Horseradish Cream and Caramelized Onions

Close-up of several steak crostini appetizers topped with rare steak, creamy cheese, and caramelized onions.
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Create an impressive appetizer for your next gathering with this simple steak crostini recipe. Tender steak, creamy horseradish sauce, and sweet caramelized onions sit atop crisp toasted bread for an elegant finger food.

Ingredients

Scale
  • 1 baguette, sliced into 1/2-inch thick pieces
  • 1 tablespoon olive oil
  • 1 pound sirloin or filet mignon steak
  • Salt and black pepper to taste
  • 1 tablespoon butter
  • 1 large yellow onion, thinly sliced
  • 1/2 cup beef broth
  • 1/2 cup sour cream
  • 2 tablespoons prepared horseradish
  • 1 teaspoon Dijon mustard
  • 1 tablespoon fresh chives, chopped

Instructions

  1. Preheat your oven to 375°F (190°C). Arrange the baguette slices on a baking sheet and brush lightly with olive oil. Bake for 8 to 10 minutes until lightly golden and crisp. Set aside.
  2. Season the steak generously with salt and pepper. Heat a skillet over medium-high heat. Sear the steak for 3 to 5 minutes per side for medium-rare, depending on thickness. Remove the steak from the skillet and let it rest on a cutting board for 10 minutes before slicing thinly against the grain.
  3. While the steak rests, melt the butter in the same skillet over medium heat. Add the sliced onions and cook slowly, stirring occasionally, for 15 to 20 minutes until they are deeply softened and caramelized. Pour in the beef broth, scrape up any browned bits, and cook until the liquid evaporates. Remove from heat.
  4. In a small bowl, whisk together the sour cream, prepared horseradish, and Dijon mustard until smooth. This is your horseradish cream.
  5. To assemble the gourmet appetizers, spread a small amount of horseradish cream onto each toasted crostini slice.
  6. Top the cream with a few slices of the rested steak.
  7. Place a small amount of caramelized onions over the steak.
  8. Sprinkle with fresh chives before serving these elegant finger foods.

Notes

  • You can prepare the caramelized onions and horseradish cream up to one day ahead to save time when entertaining.
  • For a richer flavor, use a small amount of balsamic glaze drizzled over the top just before serving.
  • If you prefer a different cheese element, goat cheese or Boursin cheese work well as a base layer instead of the horseradish cream.

Nutrition

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