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Slice the peppers, onions and mushrooms.
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Saute peppers and mushrooms in a frying pan with some beef broth and slices of the leftover brisket.
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Meanwhile, make the garlic mayo by mixing 1/4 cup mayo with 1 tablespoon of minced garlic. Set aside and let flavours meld while I continuing to make sandwich.
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After the vegetables and beef are nicely sauteed, (about 10 - 15 minutes), set the pan aside and prepare sandwich buns. For this recipe I used whole wheat hot dog buns, but you can use what you wish.
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Place the buns on a parchment paper lined cookie sheet, and spread the garlic mayo evenly on both sides of the buns and set the oven to broil.
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Spoon the vegetable and beef mixture onto the buns and then add shredded mozzarella cheese over top. Pop the sandwiches in the oven under the broiler for about 5 minutes, just until the cheese is all melty.
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Let cool a couple minutes and enjoy!