Make the marinade: In a bowl, whisk soy sauce, honey, brown sugar, rice vinegar, sesame oil, garlic, ginger, and chili-garlic sauce until smooth.
Marinate the pork: Place the tenderloin in a zip-top bag or shallow dish. Pour in about two-thirds of the marinade.
Reserve the rest in the fridge for glazing. Marinate the pork 30 minutes at room temp or up to 8 hours in the fridge.
Preheat and prep: Heat your oven to 400°F (200°C). Pat the pork dry with paper towels so it sears well.
Keep the reserved marinade handy.
Sear for color: Heat a large oven-safe skillet over medium-high. Add neutral oil. Sear the tenderloin on all sides until browned, about 2–3 minutes per side.
Roast to temp: Transfer the skillet to the oven.
Roast 10–15 minutes, or until the thickest part hits 140–145°F on an instant-read thermometer. Pull it out on the earlier side for juiciness.
Rest the meat: Move the pork to a cutting board and tent loosely with foil. Rest 5–10 minutes.
This keeps it juicy and easy to slice.
Make it sticky: While the pork rests, pour the reserved marinade into a small saucepan. Stir cornstarch and water together, then whisk it into the marinade. Simmer 2–3 minutes until it turns glossy and thick enough to coat a spoon.
Glaze and slice: Slice the pork into 1/2-inch medallions.
Spoon the sticky glaze over the top, turning slices to coat. Garnish with green onions and sesame seeds.
Serve: Plate over steamed rice with extra glaze. Add a squeeze of lime and a quick side of sautéed greens or roasted broccoli.