Heat oil in a heavy pased frying pan. Add beef and saute beef for a few minutes, or until it changes a little color. To the beef add: the ginger paste, garlic paste, onion, red chilli powder, cumin powder, coriander powder, turmeric powder, salt, green peppers and plain yogurt. Mix and saute for about 15 minutes, or until the beef is well done.
Separately in a heavy based pot, boil the spaghetti and cook spaghetti in boiling water until it is well done. Then strain the spaghetti with a strainer. After straining put the spaghetti back into the pot. And put spaghetti back on stove on medium heat.
Quickly add the keema to the spaghetti and mix well. Then add the spaghetti sauce and mix. Leave the spaghetti on stove until it is well heated. (By continuously mixing.) Finally take off heat and serve hot.