Smoked Salmon Deviled Eggs with vinegar

1/4 cup butter, softened 2 tablespoons fresh dill 1 teaspoon lemon zest 1 pinch cayenne pepper salt and ground black pepper to taste 1 teaspoon white vinegar[...]

4 slices multi-grain bread 2 hard-boiled eggs , sliced 4 ounces smoked salmon 1 tablespoon capers 1 teaspoon red wine vinegar fresh dill , chopped ground[...]