HEAT a thick-bottomed pan and dry roast the black peppercorns till they puff up and set aside.
TOAST the cumin seeds till they turn slightly darker and fragrant.
GRIND the peppercorns and cumin into a coarse powder. You can also pulse it using a coffee or spice grinder to a coarse powder.
POUND or mince the ginger and garlic.
ADD ghee or oil to a hot pan.
SAUTE the onions in the pan for 5 minutes and add the curry leaves.
ADD the ginger and garlic and saute for 2 minutes.
ADD the turmeric and salt, followed by the ground peppers and cumin powder, and saute for 2 minutes.
ADD the chicken and give it a good mix, making sure that the chicken is coated with the spices.
COVER and cook the chicken till cooked, stirring it every few minutes. This should take 10-15 minutes.
ADD the jalapeños if you want to increase the heat and cook for a couple of minutes (optional).
ADD the roasted cashews and give it all a good mix.
GARNISH with chopped scallions and serve in a bowl with cumin cauli rice and an Indian-style salad.