Heat ½ cup of oil in a saucepan and add chopped tomatoes. Cook until tomatoes are tender like paste. Keep it in a separate bowl.
Heat remaining half cup of oil in another saucepan. Add fenugreek seeds. When fenugreek seeds crackle, add thin chopped onions. When onions change color add ground garlic. Fry for 2 to 3 minutes
Now add chicken and fry for 4 to 5 minutes add salt and crushed red chili and mix well.
Add tomato paste (already prepared) mix well and cover. When chicken is tender and gravy is formed, add crushed cumin, coriander powder, ginger, dried fenugreek, and green chili. Mix well and cover for 5 minutes.
For Coal Smoke, take a shell of onion place in karhai. Heat a piece of coal and place burning coal on onion shell. Drop few drops of oil on coal and cover for 5-7 minutes.
Koila Karhai with aroma of coal is ready to serve.