Spinach Salad with Apples and Maple-Cider Vinaigrette Ingredients: 1 package (10-oz.) baby spinach 1 Red Delicious apple, cored and thinly sliced 1 small red onion, thinly sliced 4 ounces crumbled feta cheese 1/3 cup cider vinegar 2 tablespoons pure maple syrup 1 tablespoon Dijon mustard 1/4 teaspoon kosher salt 1/4 teaspoon freshly ground black pepper 2/3 cup olive oil Preparation: Remove the stems from