1/2 cup kosher salt
1 cup sugar
2 tablespoons cracked white peppercorns
2 1/2 to 3 pounds fresh, skin-on salmon fillet, in one piece, any pin bones removed
2 to 3 large bunches fresh dill, coarsely chopped, including stems

Mustard Sauce
2 tablespoons honey mustard
1 teaspoon Dijon mustard
2 teaspoons sugar
1 1/2 tablespoons white-wine vinegar
Pinch of salt
Pinch of freshly ground black pepper
1 tablespoon strong black coffee, cold
3/4 cup grapeseed or canola oil
1/2 cup chopped fresh dill