Step 1

For the Sea Island dressing: Combine the mayonnaise, ketchup, relish, sriracha, House Seasoning and Worcestershire sauce in a small bowl. Set aside.

Step 2

For the Reubens: Melt 1 tablespoon butter with the oil in a large skillet over medium-high heat. Add the onion and sprinkle with a little salt. Cook until the onion begins to soften, about 5 minutes. Stir in the sauerkraut and cook until the mixture begins to brown, about 5 more minutes. Remove the onion and sauerkraut from the skillet to a medium bowl, and set aside. Wipe out the skillet, if necessary, for cooking the sandwiches.

Step 3

Spread some Sea Island dressing on each of 6 slices of bread, then top each with 1 slice of the cheese, some corned beef, fried sauerkraut and onions and another slice of cheese. Top each with the remaining slices of bread.

Step 4

Melt 3 tablespoons butter in the same skillet. Add three sandwiches. Cook until each side is golden and crispy, 3 to 4 minutes per side. Repeat with the remaining butter and sandwiches.

Step 5

Stir together the garlic and onion powders, paprika, salt and pepper in a small bowl. Store in an airtight container.