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Grilled Steak Crostini with Horseradish Sauce

Steak crostini are an elegant and flavorful appetizer featuring thinly sliced, seared steak on toasted baguette slices. They are topped with sweet and savory caramelized onions and a creamy horseradish sauce for a perfect balance of textures and tastes. It's a simple yet impressive dish that's perfect for parties or gatherings.
Prep Time20 minutes
Cook Time20 minutes
Total Time40 minutes
Course: Appetizer, lunch, Snack
Cuisine: American
Servings: 24
Author: Kellie
Cost: $20

Equipment

  • 1 grill

Ingredients

For the Steak

  • 8 ounces Filet Mignon Steaks
  • 2 tablespoons olive oil if desired
  • 2 tablespoons Steak Seasoning

For the Horseradish Sauce

  • 1 cup sour cream
  • 1/4 cup prepared horseradish
  • 1 1/2 tablespoons dijon mustard
  • 1 teaspoon champagne vinegar
  • 1 teaspoon worcestershire sauce
  • 1/2 tablespoon fresh chopped chives
  • salt and pepper to taste

For the Crostini

  • 1 Day old Baguette cut into 1/4 inch slices
  • 2 tablespoons butter melted
  • 1/4 cup olive oil
  • 1 garlic clove smashed, optional

For the Caramelized Onions

  • 1 onion diced
  • 1 tablespoon olive oil
  • 1/2 tablespoon butter
  • 1/4 teaspoon sugar
  • Kosher salt to taste
  • Chopped Fresh Chives optional
  • Balsamic Glaze optional

Instructions

To grill the steaks

  • Preheat gas grill to 450 degrees or prepare a charcoal grill.
  • Season the steaks liberally with kosher salt and black pepper on both sides.
  • Add the steaks to the grill and close the lid. Cook until a crust has formed and golden brown, approximately 4-5 minutes.
  • Flip the steaks and close the lid. Continue grilling for an additional 4-5 minute or until the desired degree of doneness. (see chart above for grilling times.) 125 degrees for medium rare.
  • Transfer the steaks to a platter and cover with foil.
  • Allow the steaks to rest for 10 minutes before serving. While the steak is resting, make the other items.

To Make the Horseradish Sauce

  • Whisk together the sour cream, horseradish, dijon, vinegar, worcestershire sauce, salt, pepper and chives.
  • Make the Crostini
  • Preheat oven to 375 degrees F (190 degrees C).
  • Slice the baguette crosswise into 1/4 inch thick slices
In a small bowl, stir together the butter, olive oil, and garlic. 
Brush the oil mixture on both sides of the bread. Arrange the bread on a baking sheet.
 Bake at 375 degrees F (190 degrees C) for 5 minutes, or until lightly toasted. Flip and bake for an additional 3-4 minutes until toasted and crisp.
Remove from the oven and cool to room temperature.

Make the Caramelized Onions

  • Heat the olive oil and butter in a skillet over medium high heat.
  • Add the onions and cook until deeply caramelized, stirring occasionally to avoid burning, approximately 15-20 minutes.
  • Stir in the sugar and cook for an additional 3-4 minutes.
  • Season with salt, to taste.
  • Top each Crostini with 1 teaspoon horseradish sauce.
  • Slice the steak across the grain and top each crostini with a slice of steak.
  • Top the steak with 1/2 tablespoon onions. Garnish with chopped chives and drizzle with balsamic glaze, if desired.

Notes

Each step can be made in advance to save time. Assemble the crostini right before serving to avoid soggy crostini.

Nutrition

Calories: 123kcal | Carbohydrates: 7g | Protein: 3g | Fat: 9g | Saturated Fat: 3g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 5g | Trans Fat: 0.05g | Cholesterol: 15mg | Sodium: 106mg | Potassium: 73mg | Fiber: 0.5g | Sugar: 1g | Vitamin A: 109IU | Vitamin C: 1mg | Calcium: 29mg | Iron: 1mg