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Preheat the grill to a searing 220°c and Set up for two zone cooking.
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In a bowl, mix brown sugar, bourbon, soy sauce, mustard, and olive oil. Rub over steaks and let sit for at least 30 mins.
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Sear the steaks directly over the flame for 2–3 mins a side until caramelised.
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Move the steaks to indirect heat and cook until medium-rare (internal 54°C).
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Rest for 5 mins before slicing.
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Whilst the steaks are resting, melt the butter with olive oil in a cast iron pan. Add onions, sugar, and thyme, and cook slowly until golden and jammy.
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Toss in the mushrooms and cook until soft, smoky, and slightly crisp on the edges.
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In a separate saucepan, melt the butter and stir in the mustard and honey until silky smooth. Keep warm for dunking glory.
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Toast the buns cut-side down for approximately one minute and get ready to assemble.
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Pile on the bourbon steak slices, spoon over the onions and mushrooms, sprinkle crispy onions, and close with a dramatic squish.
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Serve with the mustard butter dip in a pot on the side.
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Drip. Dunk. Destroy.