Now add in the ginger and garlic paste and stir for another minute. Then add the tomatoes and cook for two minutes until they start to disintegrate. Now, mix in the curry powder and fry for 10 minutes until you can see oil oozing through the spice paste, i.e. the masala. If the paste gets stuck to the bottom of the wok, add a tablespoon or two of hot water and loosen it off.