Serves 4 INGREDIENTS 6 large or 8 medium celery stalks 1⁄3 cup roughly chopped walnuts 2 tablespoons freshly squeezed lemon juice 2 tablespoons Dijon-style mustard 1 garlic clove, crushed 2 teaspoons honey ½ teaspoon coarse sea salt or kosher salt 5 tablespoons extra-virgin olive oil Freshly milled black pepper 1 large Granny smith apple ¼…