Ingredients 

• Six medium potatoes
• Two medium, ripe tomatoes 
• Half inch ginger
• One medium onion
• Jeera
• Haldi
• Garam masala
• Salt to taste
• Two green chillies
• Four tablespoons cooking oil

• Peel the potatoes, cut them in four pieces each and soak them in water.
• Slice the onion thin and mince/grate ginger.
• Cut tomatoes in six pieces each. 
• Heat oil in a cooker on medium high and add jeera, onion, ginger, tomatoes, haldi, green chillies and garam masala.
• Stir everything till this masala leaves the oil.
• Add the potatoes, mix them well with the masala.
• Add one cup water and close the lid of the cooker. Remove it from heat after two whistles. Open the cooker after fifteen minutes.