Preheat oven to 350°. Put walnuts in a pie pan. In another pie pan, toss bread with 1 tbsp. oil. Bake walnuts and bread, stirring occasionally, until walnuts are golden and croutons are golden and crisp, 12 to 15 minutes. Let cool. Coarsely chop nuts.
Whisk remaining 3 tbsp. oil, the zest, orange juice, spices, and 1/4 tsp. each salt and pepper in a large bowl. Toss gently with lettuce, frisée, apple, nuts, and croutons. Add more salt and pepper to taste if you like.
*Find at well-stocked grocery stores and latourangelle.com
Note: Nutritional analysis is per serving.