This dish, originating from the Indian subcontinent, features a creamy, tomato-based sauce, but its precise origins are debated, with some claiming a Scottish chef adapted it in the UK. What is it?

1. The sauce often includes butter and aromatic spices.
2. It is frequently served with naan bread or rice.
3. A popular variation includes marinating the main ingredient overnight before cooking.
4. It is one of the most ordered dishes in Indian restaurants worldwide.