The cookbook says that Koshary is sold in the streets of Egypt and is popular among Coptic Christians during Lent.
Here is the recipe as I made it last night. The original calls for the lentils and rice mixture to be put on top of macaroni.
1 small can tomato paste
3 c. crushed tomatoes
3/4 C chopped celery with leaves
1 1/4 C lentils
3C boiling water
2T. olive oil
chopped green onions
Heat oil in cast iron or other heavy frying pan.
Fry lentils in hot oil for 5 minutes.
Carefully add boiling water and stir.
Heat on medium for 10 minutes
Stir in celery, tomato paste, crushed tomatoes and spices.
Cook for 10 more minutes to blend flavors.
Serve over cooked brown rice.