How to Make It
Process mayonnaise, chives, vinegar, anchovy paste, lemon zest, lemon juice, black pepper, 1⁄4 cup of the fresh parsley leaves, 1 tablespoon of the fresh tarragon leaves, and 1⁄4 teaspoon of the salt in a food processor until smooth, about 1 to 2 minutes. Set aside.
Bring water, quinoa, and remaining 1⁄2 teaspoon salt to a boil in a medium saucepan over medium-high. Stir and cover. Reduce heat to low, and cook until quinoa is tender and liquid is absorbed, about 15 minutes. Remove from heat; let stand 5 minutes. Remove lid, and fluff with a fork.
Toss together butter lettuce and remaining 1⁄4 cup each fresh parsley leaves and fresh tarragon leaves. Toss lettuce mixture lightly with about 1⁄4 cup dressing. Transfer to a serving platter. Sprinkle cooked quinoa over lettuce mixture; top with pulled rotisserie chicken. Arrange thinly sliced English cucumbers and thinly sliced radishes on top and around sides. Drizzle salad with an additional 1⁄4 cup dressing, and serve remaining dressing on the side, if desired.