Crispy crostini topped with creamy horseradish sauce, sweet caramelized onions, and tender slices of seared steak—perfect for elegant appetizers and party platters.
1 French baguette, sliced
1 lb sirloin or ribeye steak
2 yellow onions, thinly sliced
2 tbsp butter or olive oil
Salt and black pepper
½ cup sour cream or crème fraîche
1–2 tbsp prepared horseradish
1 tsp Dijon mustard
1 tsp lemon juice
Optional: parsley, thyme, Parmesan shavings
Caramelize onions in butter over low heat for 30–40 mins.
Mix horseradish sauce and chill.
Toast baguette slices at 375°F until golden.
Sear steak 2–3 mins per side, rest, then slice thinly.
Spread sauce on crostini, top with onions and steak.
Garnish and serve warm or at room temp.