First soak the black beans atleast for 6 hour

Now turn the cooker close and have 6 to 7 whistles

On the other hand in a heavy base pan add oil and roast cumin seeds+ginger+garlic

Now grind the onion and add paste to roasting cumin mixture

Roast onion paste until it looks golden and spread oil all around at low flame

Add tomatoes paste with all the spices together

Now roast this curry masala for atleast 25 minutes

Now check the beans and take out the extra water.water can be use as beans soup.

Add pinch of rock salt and black pepper to the soup.its really healthy

Now add boiled beans to masala and peeled diced potatoes too

Boil the gravy at low flame until it mix with beans properly and potatoes softened slightly

Yummy healthy nutritious black beans gravy is ready