In a blender jug, add tomatoes, fried onion and green chili, blend well & set aside.
In a bowl,add yogurt,tikka masala,lemon juice & mix well.
Add chicken & mix well, cover & marinate for 30 minutes.
In a wok,add cooking oil,marinated chicken,mix well & cook on medium flame until chicken is tender (12-15 minutes) then cook on high flame until oil separates.
Add button red chillies & mix well.
Add blended mixture & mix well for 2-3 minutes.
Add coriander powder,salt,cumin seeds,red chilli powder,garam masala powder,turmeric powder, mix well & cook on medium flame for 4-5 minutes.
On low flame,add cream & mix well.
Add dried fenugreek leaves,fresh coriander & mix well,cover & cook on low flame for 10-12 minutes.
In a serving clay pot,add desi ghee & let it melt.
Add capsicum,onion & sauté for a minute.
Add prepared chicken handi & mix well.
Garnish with fried onion & serve.