Toast salt, ground black pepper and cumin in a small pan over slowest fire until aromatic.
Cut king oyster mushroom into 2 to 3 cm thickness tubes. Cut some cross lines on one side.
Brush some oil in a pan and place the king oyster mushrooms in. Use middle fire and fry one side until slightly seared and then turn over the fry the other side. The whole process should be around 3-5 minutes and mushrooms should be cooked slowly.
Transfer to serving plate, spread our spice mix. Place 1/2 tablespoon of chili sauce as another choice of dipping.