Step 1

Stir all the sauce ingredients together in a bowl until they are well combined.

Step 2

Heat the butter in a small saucepan over medium heat

Step 3

Add in the onion and soy sauce. Cook over medium heat until the onions are soft.

Step 4

Spread butter on one side of each slice of bread. Place all slices of the bread onto a heated griddle butter side down. Immediately place the cheese onto two slices of bread. Allow to cook on low heat to allow the cheese to melt and the bread to toast. Once the bread is toasted turn off the heat. Scoop half the grilled onions on top of the bread with the melted cheese. Top with the special sauce. Then place the other slices of toasted bread, toasted side up, on top to create the sandwich. Enjoy!