Make sure the oven rack is in the middle position, or positioned so that the baking tray ends up being 8-10 inches away from the broiling element. If too close, the chicken will burn before the thighs can fully cook.
Place the prepared asparagus on one side of an aluminum foil lined baking tray. Drizzle them with the 1 tablespoon of olive oil and sprinkle with the salt. Toss them around to coat, , making sure they end up in a single flat layer, and to one side.
Take the chicken thighs out of the marinade, letting excess liquids drip off of them, before placing onto the other side of the tray with the smooth side of the chicken facing up. Lightly press down on the chicken thighs, to make sure they are as flat as they can be to encourage even cooking.
Turn on the broil setting on your oven. When nice and hot, place the the baking tray under the broiler, again, making sure that the tray is 8-10 inches away from the broiler elements.
Cook the chicken and asparagus for 7 minutes. Carefully remove from the oven and rotate the asparagus so they roast evenly. Do not flip the chicken oven.
Return to the oven and cook for another 2-3 minutes while keeping a very close eye on it. The chicken will have nice charred edges and should be fully cooked.
Remove from the oven and use a meat thermometer if you have one. The internal temperature in the thickest part of the chicken thigh should be at least 165-175F. If it is not yet at temperature, remove the asparagus from the tray so they do not burn, and return the chicken for another couple minutes to complete cooking.
Serve the chicken and asparagus on a bed of rice and drizzle with the reserved marinade. Do not use any marinade that has been used to marinate the raw chicken. Garnish with the optional sesame seeds and chopped green onion.