- 2 tablespoons coarsely chopped pistachios
- 1 tablespoon fennel seeds
- 1 tablespoon plus 1/4 cup olive oil
- Kosher salt
- 1 small fennel bulb, thinly sliced lengthwise
- 4 cups torn butter lettuce, romaine hearts, or Little Gem
- 1 1/2 cups fresh parsley leaves with tender stems
- 1/2 cup fresh tarragon leaves, torn if large
- 2 tablespoons chopped fresh chives
- 1 tablespoon finely grated lemon zest
- 2 tablespoons fresh lemon juice
- 1 tablespoon grated peeled horseradish or
- 2 tablespoons prepared horseradish
- Freshly ground black pepper
- Toss pistachios, fennel seeds, and 1 tablespoon oil in a small skillet over medium heat and cook, stirring occasionally, until fragrant, about 3 minutes. Season with salt. Transfer to a small bowl; let cool.
- Toss fennel, lettuce, parsley, tarragon, chives, lemon zest, and horseradish in a large bowl. Add lemon juice; season with salt and pepper and toss to coat.
- Add remaining 1/4 cup oil and toss to coat, then add half of pistachio mixture and toss just to combine. Season with salt, pepper, and more lemon juice, if desired.
- Serve salad topped with remaining pistachio mixture.
- Do ahead: Pistachio mixture can be made 2 days ahead; store tightly wrapped at room temperature.