2 pounds zucchini, trimmed
1 teaspoon kosher salt
3 tablespoons extra-virgin olive oil
2 tablespoons freshly squeezed lemon juice
2 teaspoons whole-grain mustard
1/2 teaspoon freshly ground black pepper
1/2 small red onion, thinly sliced
1 cup frisee torn into pieces
1/3 cup thinly sliced radishes
1/3 cup chopped, toasted almonds
1/3 cup chiffonade fresh basil leaves
1 -ounce Manchego cheese, shaved