Preheat oven to 400°F
Pat the salmon very dry with paper towels. Lightly season the flesh side with sea salt.
Heat a stainless steel skillet over medium-high heat.
Add 1–2 tsp neutral oil. When shimmering, place salmon flesh side down. Press gently with a spatula for 10 seconds to keep flat.
Cook undisturbed 3–4 minutes until it releases easily.
Gently flip fillets. Immediately brush a generous layer of sweet chili sauce over the flesh (about 1½ Tablespoon per fillet).
After 2-4 minutes, transfer the steel pan directly to the oven and bake 6-7 minutes (internal temp 120–125°F for medium-rare).
Remove from oven, brush with one final thin layer of sauce, then switch to broil. Broil 1–2 minutes until the glaze is bubbling and lightly caramelized (watch closely).
Rest 2 minutes, finish with toasted sesame seeds, and serve.