If using oven, preheat it to 200 C or 390 F for at least 15 mins.
Add all the spices, salt & kasuri methi to a prepared baking tray, lined with a foil. Mix together and make a well in the center. (if you are air frying, you may use a mixing bowl instead)
Pour oil and lemon juice. Begin to mix adding more water until it becomes a smooth thick paste. We don't want a runny marinade. Taste this and adjust salt and lemon juice.
Pat dry your salmon with kitchen tissues and transfer to the baking tray. Smear the marinade on both the sides. If you want you may rest for 15 mins but that is optional.
In the oven: Bake at 390 F or 200 C for 10 to 12 mins. Later broil for 3 to 4 mins.
In the Air Fryer: If your air fryer requires preheating do it for 2 mins at 390 F or 200 C. Spray oil lightly into your basket/tray. Place the marinated salmon fillets in the basket/tray.
Air fry at 390 F or 200 C, for 7 to 10 mins depending on the thickness of your fillet. Fillets around 1 inch thick need 8 to 9 mins.
To check if it is fully cooked, poke it with a fork. It should flake easily. You may check using a instant read thermometer. Internal temperature should be 145F.
Serve Tandoori salmon hot or warm as an appetizer or a side. Drizzle some lemon juice if required.