In a blender or food processor, combine the ginger, garlic, cashews and 1/3 cup/80 ml water. Process until very smooth. If you need to add a little more water to get a smooth consistency, do so.

In a large bowl, combine the cashew puree with the yogurt, cardamom pods, coriander, turmeric, black pepper, salt, cinnamon stick, cloves and bay leaves. Add the chicken and mix well to coat.

In a Dutch oven or wide pot, melt the butter. Add the garam masala and the onion, and cook over medium heat until soft and brown, 7 minutes. Add the chicken and yogurt mixture.

Cover the pot and bring to a simmer. Once the mixture is simmering, remove the lid and continue to simmer gently, stirring occasionally, until chicken is cooked through and tender, about 30 minutes.

Garnish with cilantro and serve.