Warm the olive oil in a 10-inch cast iron skillet over medium-high heat. When you can hold your hand 6 inches above the pan and feel the heat, it is ready.
Add Brussel sprouts to the pan in a single layer, cut side down. When you have a full layer, place the remainder on top of the cut side down ones. Cook until the ones on the bottom begin to caramelize, about 2-3 minutes. *See NotesStir, bringing as many of the Brussel sprouts from the bottom of the pan up to the top as possible. Continue cooking for another 2-3 minutes.
Meanwhile, to a small bowl, add sesame oil, honey, chili paste, minced garlic, and salt. Whisk to combine, then set aside.Pour sauce over the vegetables in the pan, stir well to combine, and reduce heat to low. Cover pan and cook for 2-3 minutes. Remove from heat, stir once more, and transfer to a serving dish. Enjoy!
Notes
If the Brussels sprouts are getting too browned, stir and reduce heat to medium.You can find chili paste in the produce section of most grocery stores.