Lettuce Hearts with Shaved Hazelnuts

Name: Lettuce Hearts with Shaved Hazelnuts
Yield: 4 Servings
Ingredients: 1/2 cup vegetable oil; 2 tablespoons (or more) fresh lemon juice; Kosher salt; 4 heads of Little Gem or 2 heads of Bibb lettuce, leaves separated and hearts halved through root (about 8 cups); 1 cup mixed flat-leaf parsley, sorrel, and nasturtium leaves; 5 blanched hazelnuts