- 1/4 small red onion, thinly sliced
- 2 tablespoons crème fraîche
- 2 tablespoons extra-virgin olive oil
- 1 tablespoon fresh lemon juice
- 1 tablespoon red wine vinegar
- 6 cups torn escarole hearts (from about 2 heads)
- 2 tablespoons rinsed capers
- Kosher salt, freshly ground pepper
- 1/4 cup shaved peeled horseradish
- Soak onion in a small bowl of ice water at least 30 minutes. Drain and pat dry.
- Whisk crème fraîche, oil, lemon juice, and vinegar in a large bowl. Add escarole, capers, and drained onion; season with salt and pepper and toss to coat.
- Top salad with horseradish and season with more pepper.
- DO AHEAD: Onion can be soaked 2 hours ahead. Drain just before using.