In a mixing bowl, combine mayonnaise, ketchup, horseradish, onion, and hot sauce. Stir until well blended and set aside.
Lay out two slices of raisin pumpernickel bread.
Spread Russian dressing on each slice of bread.
Layer smoked peppered turkey on one slice of bread.
Place muenster cheese over the turkey.
On top of the cheese, add tomato slices and avocado slices.
Sprinkle alfalfa sprouts on top of the avocado.
Place the second slice of bread on top and press down gently.
Slice the sandwich in half and serve immediately.