2 English cucumbers
2 teaspoons kosher salt
1/2 cup cider vinegar
1/4 cup sugar
1 tablespoon dry mustard
2 teaspoons drained bottled horseradish
1 tablespoon chopped fresh dill
1 loaf rye bread (1 pound)
2 (6 to 8-ounce) pieces semisoft cheese (preferably German, such as Cambozola or Mirabo)