Ingredients

• 1/2 cup walnuts
• 1/4 cup neutral vegetable oil, such as grapeseed, divided
• 4 ounces lamb sausage in casing, sliced into 1/4"-thick coins
• 1 tablespoon plus 1 teaspoon prepared horseradish
• 2 tablespoons fresh lemon juice
• 2 teaspoons honey
• 1/4 teaspoon (or more) kosher salt
• 1/8 teaspoon (or more) freshly ground black pepper
• 1/2 cup flat-leaf parsley leaves, divided
• 1 romaine heart (about 8 ounces), coarsely chopped
• 1/2 medium apple, such as Honeycrisp, Gala, or Fuji, thinly sliced
• 2 hard-boiled eggs, quartered

Instructions

1. Preheat oven to 350°F. Toast walnuts on a rimmed baking sheet, tossing once, until golden brown, 8–10 minutes. Let cool; coarsely chop.
2. Heat 1 Tbsp. oil in a medium skillet over medium-high. Cook sausage, turning occasionally, until browned on both sides, 3–5 minutes. Transfer to a plate.Meanwhile, whisk horseradish, lemon juice, honey, 1/4 tsp. salt, and 1/8 tsp. pepper in a medium bowl. Slowly whisk in remaining 3 Tbsp. oil in a steady stream. Coarsely chop 2 Tbsp. parsley and stir into dressing.Toss romaine, apple, sausage, and remaining parsley in a large serving bowl. Add two-thirds of the dressing and toss to coat; season with salt and pepper if necessary. Top with walnuts and eggs; drizzle with remaining dressing.
3. Heat 1 Tbsp. oil in a medium skillet over medium-high. Cook sausage, turning occasionally, until browned on both sides, 3–5 minutes. Transfer to a plate.
4. Meanwhile, whisk horseradish, lemon juice, honey, 1/4 tsp. salt, and 1/8 tsp. pepper in a medium bowl. Slowly whisk in remaining 3 Tbsp. oil in a steady stream. Coarsely chop 2 Tbsp. parsley and stir into dressing.
5. Toss romaine, apple, sausage, and remaining parsley in a large serving bowl. Add two-thirds of the dressing and toss to coat; season with salt and pepper if necessary. Top with walnuts and eggs; drizzle with remaining dressing.
6. Do Ahead Dressing, without parsley, can be made 3 days ahead. Cover and chill.
7. Dressing, without parsley, can be made 3 days ahead. Cover and chill.