Mangori is small dry balls made by moong dal paste. Mainly used in northern part of India.You can find mangories into any good spice shop very easily. Punjab produces best mangoris and vadis(urad dal). Here is the recipe for very spicy n yum curry. 

Ingredients ~ 
1 Cup Mangori 
2 Medium potatoes washed n chopped into medium small pcs

4 Medium green chillies washed n chopped finely

2 Medium onions peeled n finely chopped 

2 Big tomatoes washed n grated into puree

4 Tbsp freshly grated ginger

2 Tbsp freshly grated garlic

1 Tsp heeng (Asofoetida) 

1 Tsp jeera (cumin seeds)

1 Tsp black pepper powder

1 Tsp Haldi (turmeric)

2 Tbsp salt

1 Tbsp Garam Masala

3-4 Tbsp dry coriander powder

1 Tbsp Kasuri methi powder ( dry fenugreek)

8-10 Tbsp desi ghee (Butter oil) 

Method of preparation ~ 

1- Fry mangoris into heated 2-4 tbsp desi ghee till golden brown
2- Crushed with heavy thing into semi thick powder and soak into 1 cup of water

3- Heat remaining desi ghee into cooker and fry the onions, garlic, ginger and green chillies for 5-6 minutes on the low flame till golden brown.

4- Add heeng, jeera and all spices to fried onions and fry for 2-3 minutes. 

5- Add tomato puree and stir well.

6- Keep frying for 3-4 minutes on high flame.

7- Now add chopped potatoes and soaked mangoris. Mix very well. 

8- Now add 6 cups of water and close the cooker lid.

9- On lowest flame take 4-5 whistles.

10- Serve with hot chapatis or boiled rice.