Pat the steak cubes dry with paper towels and season generously with salt and pepper.

In a medium bowl, whisk together balsamic vinegar, soy sauce, honey, and minced garlic.

Heat olive oil in a large cast-iron skillet or heavy-bottom pan over high heat until it's almost smoking.

Add steak bites in a single layer, working in batches if necessary to avoid overcrowding. Sear for 2-3 minutes per side for medium-rare.

Remove the steak bites and set aside. Lower heat to medium.

Pour the balsamic mixture into the pan, scraping up any browned bits. Let it simmer for 2-3 minutes until it starts to thicken.

Add butter and return the steak bites to the pan, tossing to coat in the glaze. Cook for another minute until everything is well combined and heated through.