Peel and prick potatoes, soak 30 minutes in 720 mils water + 1 dessertspoon of salt.
Drain and dry potatoes.
Heat oil and fry potatoes brown.
Roast the spices listed under "Dry Roast Spices".
Grind garlic and ginger with dry roast spices and a little water.
Reheat oil, brown the grated onions.
Remove pan from fire, add red chili, turmeric, crushed green cardamom seeds, salt, and spice paste. Cook on a slow fire.
Beat the yogurt, add a little at a time until half is used.
Add potatoes, cook 5 minutes.
Add remaining yogurt and hot water, slow cook for 20 minutes (or until potatoes are cooked).