Spicy Lentil Soup with chicken

This recipe is cookbook called 1000 low fat.  I use often this cookbook these days. I added chicken to this recipe. It was very tasty.
 Ingredients 

1/2 cup red lentil
1 chicken breast chopped finely
2 tsp vegetable oil
1 large onion, finely chopped
2 garlic cloves, crushed
1 tsp ground cumin
1 tsp ground coriander
1 tsp garam masala
2 tbsp tomato paste
4 cups chicken stock
12 oz can corn, drained
Cilantro
salt and pepper
Preparation method
Rinse the red lentils thoroughly under cold running water. Drain well and set aside.
Heat the oil in a large nonstick pan and fry the onion  and garlic gently until soften.
Add chicken and cook 5 minutes and then stir cumin, coriander, garam masala, tomato paste and 4 tbsp of the stock. Mix well and simmer gently for 2 minutes.
Add the lentils and pour in the remaining stock. Bring to a boil, reduce the heat, cover and simmer for 1 hour until the lentils are tender. Stir in the corn and heat  through for 5 minutes, Season with salt and pepper.

Sprinkle cilantro and serve with warmed pitas.