Smoked Salmon and Frisee Carpaccio

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1/2 apple, such as Granny Smith or honey crisp, peeled, cored, and coarsely chopped

3 tablespoons apple cider vinegar

1 tablespoon fresh lemon juice

2 tablespoons maple syrup

1/3 cup extra-virgin olive oil

1/2 teaspoon kosher salt

1/4 teaspoon freshly ground black pepper

1 large or 2 small heads frisee lettuce, torn

1 large avocado, peeled, seeded, and cut into 1/2-inch cubes

1/2 cup chopped walnuts, toasted ( see Cook's Note)

8 ounces smoked salmon