Mix 2 tbsp honey, 1 tbsp brown sugar, 3 tbsp soy sauce, 2 tbsp Worcestershire sauce, 1/2 tsp Asian chili sauce, 2 cloves garlic, grated and 2 tbsp bourbon or whiskey in a small bowl and stir to combine. Cut 1 1/2 lbs tenderloin tips or steak bites into cubes of roughly the same size.
Add marinade and 1 1/2 lbs tenderloin tips or steak bites to a small bowl or a plastic resealable bag and message to make sure that beef is fully covered. Refrigerate for a half hour then remove beef from marinade and pat dry with paper towels. Reserve remaining marinade.
Quarter 14-18 whole shiitake or cremini mushrooms and set aside until ready to cook.
Add 1/2 tbsp olive oil to 10" skillet over medium-high heat for 1-2 minutes.
Add tenderloin tips to skillet and cook for 1-2 minutes, or until the first side is nicely caramelized. Do not crowd the beef, sear in 2 batches if required.
Flip the tenderloin to the second side and continue to cook for another 2-3 minutes or until the second side is nicely caramelized.
Remove the tenderloin to a plate, then, in the same skillet, add 2 tbsp unsalted butter. Once the butter melts, add 14-18 whole shiitake or cremini mushrooms, quartered, and sauté until the mushrooms are deeply browned and lightly crisp at the edges.
Return tenderloin tips to pan, season with kosher salt and freshly ground black pepper and add a couple of tablespoons of the reserved marinade. Toss to combine, sauté for another 2-3 minutes.