Place the sliced onion, 2 tablespoons of the butter, ? teaspoon salt, and a pinch of black pepper in a skillet over medium heat.

Cook the onions, stirring frequently, for 45 minutes, until they have caramelized into a deep brown color.

Remove from heat and set aside to cool for 5-10 minutes.

Place the remaining 10 tablespoons butter, the caramelized onions, garlic, Worcestershire, thyme, parsley, and a pinch of salt & pepper into the bowl of a food processor.

Pulse until the ingredients are fully incorporated and the mixture is smooth.

Refrigerate until ready to serve!