Apple Walnut Salad with an Herbed Lemony Dressing⠀

Name: Apple Walnut Salad with an Herbed Lemony Dressing⠀
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: American
Ingredients: 1 (5 ounce) box tender salad greens (such as red leaf lettuce)⠀; 1 green apple, very thinly sliced; 1 small bulb of fennel, shaved thin; 1/4 of a small red onion, thinly sliced; 1 tablespoon fresh lemon juice; 1/2 cup toasted walnuts, for topping; 1/2 cup crumbled feta cheese (optional), for topping; 2 1/2 tablespoons lemon juice; 3 tablespoons olive oil; 1/2 teaspoon sea salt; Fresh cracked black pepper⠀; 1 teaspoon grainy mustard; 1 tablespoon maple syrup (or honey); 1 tablespoon chopped fresh parsley, plus more for garnish