Begin by preparing the balsamic caramelized onions. In a skillet, add butter or olive oil and melt over medium heat. Add thinly sliced onions. Brown onions for approximately 10 minutes, stirring often to prevent burning. Add salt at the halfway point.

After the onions are caramelized, add balsamic vinegar to deglaze the pan. Cook for 1 additional minute and turn off heat.

Place bread down on your prep surface.

Spread on a thin layer of goat cheese to the cut side of the bread.

Add a spoonful of balsamic onions and then top with sliced sirloin.

Add a handful of fresh arugula and finish with the second piece of bread.

This recipe will create 4 sandwiches.