Preheat oven to 160°C.
Place cashews into TM bowl and mill 10 sec/speed 10.
Remove from bowl and set aside.
Place butter, garlic, onions, ginger, cumin, turmeric, curry powder into TM bowl and chop 4 sec/speed 5. Scrape down sides of bowl.
Saute 5 min/Varoma/speed 1.
Add milled cashews and tomatoes and blend 10 sec/speed 8.
Place chicken into a large casserole dish with a lid. Cover with the sauce.
Cook, covered for 1 hour.
Add yoghurt and stir through. Cook 30 minutes, uncovered.
Stir through garnishes and serve with steamed rice and naan.