My dad used to grill mushrooms with a few spices on his makeshift tandoor, converted from a coal bunker. His mushroom bhajis were incredible. See for my fresh garam masala recipe.
Give the mushrooms a wipe with a clean damp cloth and slice.
Slit the green chilli lengthways.
Place a wok on a medium heat, then add the following ingredients in this order: ghee or oil, cumin seeds, garlic paste, ginger paste and green chilli. Fry for 1 minute.
Add the mushrooms and turn the heat up to high. Fry for 5 minutes.