Make your thousand island dressing by combining all of the ingredients in a medium bowl and stir until evenly combined. Season with kosher salt to taste. Set aside.
Heat a skillet or griddle to medium low heat. Cook your Johnsonville Grillers straight from frozen for 12 to 15 minutes, flipping them every 4 to 5 minutes. Remove from the heat and set aside.
Smear one side of your bread with mayo. Toast your bread for a couple of minutes. Add your Swiss cheese to each slice of bread while still on the skillet or griddle and let the cheese melt for a couple of minutes. Add your sauerkraut and your Johnsonville Grillers. Add some of the thousand island dressing to the top slices of bread and close your reuben. Cook for 1 more minute and remove from the grill. Enjoy while hot.