Brisket Melt with Steak Sauce

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2 tablespoons clarified butter, plus more for toasting

1/2 Spanish onion, sliced 

1 cup sliced cremini mushrooms 

Salt

4 thick-cut slices rye bread 

8 slices mozzarella 

10 ounces sliced cooked brisket 

1/4 cup Steak Sauce, recipe follows

Steak Sauce:

2 tablespoons extra-virgin olive oil

4 cloves garlic, ground 

2 shallots, ground 

1 portobello cap, ground 

1/2 cup Worcestershire sauce 

1/4 cup balsamic vinegar 

2 tablespoons ketchup 

2 tablespoons brown sugar 

1 teaspoon Dijon mustard 

1 teaspoon salt 

1/4 teaspoon chili powder 

1/8 teaspoon ground allspice 

2 tablespoons dark soy sauce 

1 tablespoon molasses