Steak Crostini with Creamy Horseradish Sauce and Caramelized Shallots Recipe

If you’re craving an appetizer that truly impresses with every bite, this Steak Crostini with Creamy Horseradish Sauce and Caramelized Shallots Recipe is an absolute showstopper. Imagine tender, juicy slices of filet mignon layered atop crisp, golden baguette slices, each bite perfectly balanced by the zing of horseradish sauce and the deep sweetness of caramelized shallots. It’s sophisticated yet approachable, making it perfect for everything from casual get-togethers to elegant dinner parties. Trust me, once you try this, it will quickly become a favorite go-to recipe to wow your guests.

Ingredients You’ll Need

These ingredients are simple but essential, each playing a special role in creating the perfect harmony of flavors and textures in this dish. From the tender steak to the rich creamy sauce and sweet shallots, every item has its moment to shine.

• 1 pound filet mignon or tenderloin: Choose a tender, lean cut for the best texture and flavor.
• Salt and black pepper (to taste): Essential seasoning to bring out the natural flavors of the steak and shallots.
• 2 tablespoons unsalted butter: For richness in cooking the steak and caramelizing the shallots.
• 1 teaspoon garlic powder: Adds a subtle savory note to the steak seasoning.
• 1 teaspoon dried thyme: Herbal flavor that complements the meat beautifully.
• Baguette (thinly sliced): The crisp canvas for your toppings, toasted to golden perfection.
• Olive oil (for brushing): Brushed on the baguette slices for crispness and a hint of fruitiness.
• 1/2 cup mayonnaise: The creamy base of the horseradish sauce adds smoothness.
• 2 tablespoons horseradish: Gives the sauce its signature spicy kick.
• 1 tablespoon Dijon mustard: Adds depth and a touch of tanginess to the sauce.
• 1 tablespoon lemon juice: Brightens up the creamy horseradish sauce with citrusy freshness.
• 2 large shallots (thinly sliced): Slowly caramelized to bring out their natural sweetness.
• 1 tablespoon balsamic vinegar: Adds a rich, complex acidity to the caramelized shallots.
• 1 tablespoon brown sugar: Enhances the sweetness and helps with caramelization.

How to Make Steak Crostini with Creamy Horseradish Sauce and Caramelized Shallots Recipe

Step 1: Season the Steak

Begin by seasoning your filet mignon generously with salt, black pepper, garlic powder, and dried thyme. Make sure every inch is coated so that the steak soaks up all those wonderful flavors. Let it rest for at least 30 minutes to allow the seasoning to penetrate. This little waiting time makes a huge difference in taste.

Step 2: Prepare the Creamy Horseradish Sauce

While the steak rests, whisk together mayonnaise, prepared horseradish, Dijon mustard, and fresh lemon juice in a bowl. Season with salt and black pepper, then refrigerate this luscious sauce until you’re ready to assemble. This sauce is the zesty creamy element that takes these crostinis to the next level.

Step 3: Caramelize the Shallots

Melt butter in a skillet over medium heat and add your thinly sliced shallots. Cook slowly, stirring occasionally until they soften and turn translucent. Add balsamic vinegar, brown sugar, salt, and pepper, then continue cooking until the shallots develop a deep golden brown color and caramelized sweetness, about 30 minutes total. Patience here yields a rich, melt-in-your-mouth result.

Step 4: Cook the Steak

Heat olive oil in a skillet over medium-high heat and sear your seasoned steak to your desired doneness — I love 4 minutes per side for a perfect medium-rare. Remove the steak and let it rest to lock in those juicy juices before slicing into thin, elegant strips.

Step 5: Toast the Baguette Slices

Preheat your oven to 375°F (190°C). Brush the baguette slices lightly with olive oil and spread them out on a baking sheet. Toast for 5 to 7 minutes until they’re a beautiful golden brown, adding a satisfying crunch and a slight nuttiness to contrast the tender steak.

Step 6: Assemble the Crostini

Spread a generous layer of your creamy horseradish sauce over each toasted baguette slice. Top with a slice of the cooked steak and a spoonful of those irresistible caramelized shallots. Arrange your crostini on a platter and garnish with fresh thyme or parsley if you want to add a touch of green and extra aroma.

How to Serve Steak Crostini with Creamy Horseradish Sauce and Caramelized Shallots Recipe

Garnishes

Fresh herbs like thyme or parsley make perfect garnishes, adding a pop of color and a light herby fragrance that balances the richness. For a little extra flair, a sprinkle of coarse sea salt over the steak just before serving can enhance the flavors beautifully.

Side Dishes

This steak crostini shines as an appetizer, but it pairs wonderfully with simple sides like a crisp green salad, roasted vegetables, or a bowl of marinated olives. These sides keep the meal balanced and let the crostini truly take center stage.

Creative Ways to Present

Try serving these crostini on a rustic wooden board or a sleek slate platter for an elegant touch. You can also provide small forks or cocktail picks to help guests enjoy them without fuss at your next party. If you want to get fancy, drizzle a little balsamic glaze on top for an added touch of sweetness and shine.

Make Ahead and Storage

Storing Leftovers

If you have leftovers, keep the components separate for best texture. Store sliced steak in an airtight container in the fridge and keep the horseradish sauce and caramelized shallots in small containers. The toasted baguette slices are best eaten fresh but can be stored in a paper bag for a day or two to retain some crunch.

Freezing

The steak and caramelized shallots freeze well when sealed properly, but the baguette slices don’t freeze as well once toasted. Freeze beef and shallots separately in airtight containers or freezer bags for up to 2 months, and thaw in the fridge before assembling.

Reheating

Reheat steak gently in a skillet or microwave just until warm to prevent overcooking. Warm the caramelized shallots in a small pan over low heat. Toast the baguette slices briefly in the oven to refresh their crispness before assembling your crostini again.

FAQs

Can I use a different cut of steak for this recipe?

Absolutely! While filet mignon is tender and perfect, you can use ribeye, sirloin, or strip steak. Just be mindful of cooking times since tougher cuts might need a different approach to stay tender.

Is there a non-mayo alternative for the horseradish sauce?

Yes! Greek yogurt or sour cream work wonderfully as a base for the horseradish sauce if you prefer a lighter or tangier alternative. Just mix with horseradish, mustard, and lemon juice as usual.

How do I prevent the shallots from burning while caramelizing?

Cooking them low and slow is key. Use medium to medium-low heat and stir frequently to avoid sticking. Adding a splash of water if they start to stick helps keep them moist and soft.

Can I make this recipe vegetarian-friendly?

While the star here is the steak, you can create a vegetarian version by substituting grilled portobello mushrooms or marinated tofu slices in place of the steak for a similar hearty texture.

What wine pairs well with this steak crostini?

A nice medium-bodied red like Pinot Noir or Merlot pairs beautifully, complementing the richness of the steak and the zing of the horseradish sauce without overpowering the flavors.

Final Thoughts

This Steak Crostini with Creamy Horseradish Sauce and Caramelized Shallots Recipe is a beautiful combination of flavors and textures that makes every bite feel special. It’s perfect for entertaining, yet simple enough to enjoy any time you want to treat yourself. Give it a try, and I promise it will become one of your favorite recipes to share around the table.

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