These Roast Beef & Onion Canapés are a savory little bite that brings big flavor. They’re layered with caramelized onions, tender roast beef, and melty Gruyere on a toasted baguette slice. A bold, zesty remoulade ties everything together, making each bite feel special.
If you’re hosting a gathering or putting together a snack board, these canapés are a solid choice. The onions and sauce can be made ahead of time, which makes assembly quick and easy right before serving. They’re hearty enough to hold their own on a table full of appetizers.
Helpful Tips
- Go low and slow with the onions: Caramelizing takes time, but it’s worth it. Keep the heat on medium and stir occasionally to avoid burning.
- Use good quality roast beef: Thinly sliced deli roast beef works well, especially if it’s fresh and not overly processed.
- Toast the bread just right: You want it crisp enough to hold the toppings without turning into a crouton. Eight minutes in the oven usually does the trick.
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Roast Beef & Caramelized Onion Crostini
Ingredients
- 1 medium onion thinly sliced
- 1 tablespoon olive oil
- 1 baguette sliced (24 slices)
- ½ pound deli sliced roast beef sliced
- 1 cup gruyere thinly sliced
- ¼ cup mayonnaise
- 1 teaspoon Dijon mustard
- 1 1/2 teaspoon horseradish
- ½ teaspoon Cajun seasoning
- 1 teaspoon hot sauce
- ¼ teaspoon Worcestershire sauce
- 3-4 sprigs fresh thyme for garnish
Instructions
- Preheat the oven to 325°F.
- Add the olive oil to a large skillet over medium heat. Add the onions to the skillet and cook for 25-30 minutes, until caramelized.
- Spray or brush the baguette slices with olive oil. Set them on a baking sheet. Top with a slice of gruyere. Bake for 8 minutes, until the bread is crispy.
- To make the remoulade sauce, add the mayonnaise, Dijon, horseradish, Cajun seasoning, hot sauce, and Worcestershire sauce. Whisk until smooth.
- When the crostini are done, add a slice of roast beef, then some carmelized onions. Top with the remoulade and garnish with thyme leaves.
Nutrition
Laura is a home cook, with 25 years experience behind the stove, who spends an extraordinary amount of time in the kitchen cooking. She loves making new recipes and finding wonderful new things to eat, both at home or abroad. She spends a lot of time researching, crafting, and perfecting her recipes.