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Meat & PoultryAdvanced40 min
Caramelized Onion and Roast Beef Au Jus Crostini
This sophisticated crostini transforms the classic French Dip sandwich into an elegant appetizer. Thinly sliced, tender roast beef is layered over a creamy Gruyère spread and sweet caramelized onions, all finished with a concentrated, savory au jus reduction. The combination delivers a rich, umami-packed bite with a delightful crunch from the toasted bread.
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Ingredients
- •1 baguette, thinly sliced and toasted
- •2 tablespoons olive oil
- •2 large yellow onions, thinly sliced
- •1 tablespoon balsamic vinegar
- •8 ounces thinly sliced roast beef
- •1/2 cup beef au jus, warmed
- •4 ounces Gruyère cheese, shredded
- •Fresh thyme for garnish
- •Salt and freshly ground black pepper to taste
Prep Steps
- 1In a large skillet, heat olive oil over medium-low heat. Add sliced onions and cook slowly, stirring occasionally, for 25-30 minutes minutes until deeply caramelized and golden brown. Stir in balsamic vinegar during the last 5 minutes of cooking. Season with salt and pepper.
- 2Preheat oven to 375°F (190°C). Arrange baguette slices on a baking sheet.
- 3Top each baguette slice with a spoonful of caramelized onions.
- 4Place a small amount of thinly sliced roast beef on top of the onions.
- 5Sprinkle shredded Gruyère cheese over the roast beef.
- 6Bake for 5-7 minutes minutes, or until the cheese is melted and bubbly.
- 7Drizzle each crostini with a small amount of warm beef au jus.
- 8Garnish with fresh thyme leaves and serve immediately.
Chef's Tip & Pairing
For the best flavor, use a high-quality, rare roast beef, which will remain tender when served. This crostini pairs beautifully with a medium-bodied, savory red wine like a Cabernet Franc or a classic Bordeaux.
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