In a wok,add butter & let it melt.
Add chicken & mix well until it changes color.
Add green chilli paste,ginger garlic,mix well & cook for 2-3 minutes.
Add onion paste,tomato paste,mix well & cook for 2-3 minutes.
Add yogurt,red chilli crushed,cumin seeds,fennel seeds,coriander seeds,nigella seeds,mustard seeds,black pepper powder,turmeric powder,salt,garam masala powder,coconut powder,mix well & cook on medium flame until oil separates (6-8 minutes).
Add mixed pickle & mix well.
On low flame,add cream,mix well & cook for 3-4 minutes.
Add dried fenugreek leaves,fresh coriander,cover & cook on low flame for 8-10 minutes.
Garnish with ginger,fresh coriander,butter & serve!