
The secret is in the glaze temperature. Don't flip too early.
Whisk the miso, honey, soy sauce and rice vinegar in a small bowl until smooth. Pat the salmon skin bone-dry with paper towels.
Brush half the glaze over the flesh side of the salmon. Reserve the rest for basting.
Heat a cast iron pan over high heat. Once smoking, lay the salmon skin-side down and press firmly for 30 seconds to prevent curling.
Cook undisturbed for 4 minutes, then flip. Baste with the remaining glaze and cook for another 2 minutes for a caramelised crust.
Wilt the bok choy in the same pan for a minute. Plate everything, scatter with sesame, serve.