Grilled Steak Crostini

Why You’ll Love This Recipe

These Grilled Steak Crostini with Horseradish Sauce are a sophisticated and flavorful appetizer perfect for any gathering. The tender, juicy filet mignon steak pairs beautifully with the creamy, tangy horseradish sauce and the sweet caramelized onions. Topped with a crisp crostini, this bite-sized treat offers an irresistible combination of flavors and textures that will impress your guests and leave them asking for more.

Ingredients

For the Steak:

• 8 oz Filet Mignon steaks

• 2 tbsp olive oil (optional)

• 2 tbsp steak seasoning

For the Horseradish Sauce:

• 1 cup sour cream

• ¼ cup prepared horseradish

• 1 ½ tbsp Dijon mustard

• 1 tsp vinegar

• 1 tsp Worcestershire sauce

• ½ tbsp fresh chopped chives

• Salt and pepper, to taste

For the Crostini:

• 1 day-old baguette, cut into ¼ inch slices

• 2 tbsp butter, melted

• ¼ cup olive oil

• 1 garlic clove, smashed (optional)

For the Caramelized Onions:

• 1 onion, diced

• 1 tbsp olive oil

• ½ tbsp butter

• ¼ tsp sugar

• Kosher salt, to taste

• Chopped fresh chives (optional)

• Balsamic glaze (optional)

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Directions

Grill the Steaks:

1. Preheat a gas grill to 450°F (230°C) or prepare a charcoal grill.

2. Season the steaks liberally with steak seasoning, kosher salt, and black pepper on both sides.

3. Place the steaks on the grill, cover, and cook for 4-5 minutes until a crust forms. Flip the steaks and cook for another 4-5 minutes or until the desired doneness (125°F for medium-rare).

4. Remove from the grill and cover with foil. Let the steaks rest for 10 minutes before slicing.

Make the Horseradish Sauce:

1. In a bowl, whisk together sour cream, horseradish, Dijon mustard, vinegar, Worcestershire sauce, salt, pepper, and chopped chives until smooth and well combined. Set aside.

Make the Crostini:

1. Preheat your oven to 375°F (190°C).

2. Slice the baguette into ¼-inch thick slices.

3. In a small bowl, stir together melted butter, olive oil, and smashed garlic (if using).

4. Brush the oil mixture onto both sides of the bread slices. Arrange the slices on a baking sheet.

5. Bake for 5 minutes, flip the bread, and bake for another 3-4 minutes until crisp and lightly toasted. Let the crostini cool to room temperature.

Make the Caramelized Onions:

1. Heat olive oil and butter in a skillet over medium-high heat.

2. Add the diced onions and cook, stirring occasionally, for 15-20 minutes until deeply caramelized.

3. Stir in the sugar and cook for an additional 3-4 minutes until the onions are soft and golden brown.

4. Season with salt to taste.

Assemble the Crostini:

1. Spread 1 teaspoon of horseradish sauce on each crostini.

2. Slice the rested steak across the grain and place a slice of steak on top of each crostini.

3. Top with about ½ tbsp of caramelized onions.

4. Garnish with chopped chives and drizzle with balsamic glaze for an extra touch of flavor.

Servings and Timing

• Servings: 24 crostini

• Prep Time: 20 minutes

• Cook Time: 20 minutes

• Total Time: 40 minutes

Variations

• Cheese Option: Add a slice of creamy cheese like brie or goat cheese on top of the crostini before adding the steak for a rich, indulgent flavor.

• Different Onions: Try using red onions for a slightly milder caramelized topping.

• Spicy Kick: Add a sprinkle of red pepper flakes to the horseradish sauce or on top of the crostini for a little heat.

• Vegan Option: Swap the steak for grilled portobello mushrooms and use a plant-based sour cream for a vegan version.

Storage/Reheating

• Storage: Store leftover crostini components (crostini, steak, and caramelized onions) separately in airtight containers in the fridge for up to 2 days.

• Reheating: Reheat the steak in a skillet over low heat or in the oven to retain moisture. Re-crisp the crostini in a toaster or oven for a few minutes. Assemble just before serving.

FAQs

Can I make this dish ahead of time?

You can prepare the caramelized onions, horseradish sauce, and crostini ahead of time and store them separately. Grill the steak just before assembling the crostini for the best results.

Can I use a different type of steak?

While filet mignon is ideal for tenderness, you can use other cuts like ribeye or sirloin. Just be sure to adjust the cooking time based on the thickness of the steak.

Can I make the crostini without butter?

Yes, you can use olive oil instead of butter for a dairy-free option or to reduce the fat content.

How do I know when the steak is done?

For medium-rare, cook the steak to an internal temperature of 125°F (52°C). You can also use the finger test for doneness or cut into the steak to check the center.

Can I add extra toppings to the crostini?

Yes, you can add toppings like arugula, roasted peppers, or a sprinkle of Parmesan cheese for extra flavor.

Conclusion

Grilled Steak Crostini with Horseradish Sauce is a fantastic appetizer that combines rich, tender steak with the zing of horseradish and the sweetness of caramelized onions. The crispy crostini adds the perfect texture, making each bite irresistible. Whether you’re hosting a gathering or enjoying a special meal, these crostini are sure to impress with their bold flavors and elegant presentation. Enjoy!

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