why make this recipe
Steak Crostini with Creamy Horseradish Sauce and Caramelized Onions is a delightful and elegant appetizer that’s perfect for any gathering. This recipe brings together the rich flavors of tender steak with the zing of horseradish and the sweetness of caramelized onions, all served on crispy baguette slices. It’s easy to prepare and will impress your guests. Plus, you’ll love how it combines simple ingredients into a standout dish.
how to make Steak Crostini with Creamy Horseradish Sauce and Caramelized Onions
Ingredients :
- 1 pound filet mignon or tenderloin
- Salt and black pepper (to taste)
- 2 tablespoons unsalted butter
- 1 teaspoon garlic powder
- 1 teaspoon dried thyme
- Baguette (thinly sliced)
- Olive oil (for brushing)
- 1/2 cup mayonnaise
- 2 tablespoons horseradish
- 1 tablespoon Dijon mustard
- 1 tablespoon lemon juice
- 2 large shallots (thinly sliced)
- 1 tablespoon balsamic vinegar
- 1 tablespoon brown sugar
Directions :
- Season the steak with salt, black pepper, garlic powder, and dried thyme. Let it sit for at least 30 minutes.
- In a bowl, mix mayonnaise, horseradish, Dijon mustard, and lemon juice. Season to taste and refrigerate.
- In a skillet, melt butter and add sliced shallots. Cook them slowly until they are golden brown. Stir in balsamic vinegar and brown sugar, and cook for a few more minutes until caramelized.
- In another skillet, cook the steak to your preferred doneness, then slice it thinly.
- Preheat your oven to 375°F (190°C). Brush baguette slices with olive oil and toast them in the oven for 5-7 minutes until crispy.
- Spread the creamy horseradish sauce on the toasted baguette slices. Top with sliced steak and a spoonful of caramelized shallots. Serve warm.
how to serve Steak Crostini with Creamy Horseradish Sauce and Caramelized Onions
Serve these delicious crostini on a large platter for your guests to enjoy. They make a great appetizer for parties, gatherings, or even a cozy night at home. You can also offer additional horseradish sauce on the side for those who like an extra kick.
how to store Steak Crostini with Creamy Horseradish Sauce and Caramelized Onions
If you have any leftovers, it’s best to separate the components. Store the creamy horseradish sauce in an airtight container in the fridge for up to a week. Keep the sliced steak and caramelized onions in separate containers. The baguette slices are best eaten fresh, but you can store them in a paper bag at room temperature if you have any left.
tips to make Steak Crostini with Creamy Horseradish Sauce and Caramelized Onions
- Let the steak rest after cooking to keep it juicy.
- Use a good quality mayonnaise for a richer sauce.
- Don’t rush the caramelization of the onions; low heat will bring out their natural sweetness.
- You can use a mix of different herbs if you’d like to enhance the flavor even more.
variation
You can switch up the kind of meat you use, such as roast beef or even grilled chicken, for a different taste. Additionally, adding sliced avocado or different types of cheese can bring a new twist to the dish.
FAQs
1. Can I use a different cut of steak?
Yes, you can use other cuts like ribeye or sirloin, but be aware that cooking times may vary.
2. How can I make this recipe ahead of time?
You can prepare the creamy horseradish sauce and caramelized onions in advance. Assemble the crostini just before serving to keep the bread crisp.
3. What can I serve with these crostini?
These crostini pair well with a light salad or a selection of cheeses and crackers for a well-rounded appetizer spread.

Steak Crostini with Creamy Horseradish Sauce and Caramelized Onions
Ingredients
Steak Preparation
- 1 pound filet mignon or tenderloin Use your preferred cut of steak.
- to taste Salt and black pepper
- 2 tablespoons unsalted butter
- 1 teaspoon garlic powder
- 1 teaspoon dried thyme Feel free to use a mix of herbs.
Crostini Assembly
- 1 loaf Baguette, thinly sliced For best results, use a fresh baguette.
- to taste Olive oil, for brushing
Creamy Horseradish Sauce
- 1/2 cup mayonnaise Use a good quality mayonnaise.
- 2 tablespoons horseradish Adjust based on desired spiciness.
- 1 tablespoon Dijon mustard
- 1 tablespoon lemon juice Fresh lemon juice is preferred.
Caramelized Onions
- 2 large shallots, thinly sliced
- 1 tablespoon balsamic vinegar
- 1 tablespoon brown sugar This adds sweetness; adjust as needed.
Instructions
Preparation
- Season the steak with salt, black pepper, garlic powder, and dried thyme. Let it sit for at least 30 minutes.
- In a bowl, mix mayonnaise, horseradish, Dijon mustard, and lemon juice. Season to taste and refrigerate.
- In a skillet, melt butter and add sliced shallots. Cook them slowly until they are golden brown.
- Stir in balsamic vinegar and brown sugar, and cook for a few more minutes until caramelized.
Cooking
- In another skillet, cook the steak to your preferred doneness, then slice it thinly.
- Preheat your oven to 375°F (190°C).
- Brush baguette slices with olive oil and toast them in the oven for 5-7 minutes until crispy.
Assembly
- Spread the creamy horseradish sauce on the toasted baguette slices.
- Top with sliced steak and a spoonful of caramelized shallots. Serve warm.




