Take tomatoes, spice powders, badam, cashew in a blender and puree till smooth.
Heat 1 tblsp oil in a pan, add capsicum and saute for 2mins, remove and set aside.
In the same pan, add more oil. Crackle cumin and add in onions and cook till golden.
Add in ginger garlic paste and mix well.
Add tomatoes and cook till oil separates.
Add in water, salt and mix well.
Add in capsicum and potatoes and mix well.
Simmer for 5 mins