1. Preheat your oven to 400°F (205°C) and line a baking sheet with parchment paper for easy clean-up.
2. In a mixing bowl, whisk together the soy sauce, brown sugar, minced garlic, grated ginger, sesame oil, rice vinegar, and black pepper. If you’re a fan of a little kick, toss in those optional red pepper flakes!
3. Add the thinly sliced ribeye to the marinade and ensure each piece is well-coated. Let this sit for about 15 minutes to absorb the flavors—perfect time to slice up that onion!
4. Spread the marinated beef in a single layer on the prepared baking sheet—no overcrowding, please! Scatter the sliced onion over the top.
5. Slide that sheet pan into the oven and let it cook for about 15-20 minutes, or until the beef gets that caramelized edge we all crave.
6. Garnish with green onions and sesame seeds for a burst of fresh flavor and a bit of a crunch.
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