Cold Lentil Soup from Oma

1 c chopped onion

2 T oil

1/2 c lentils

2 1/2 c broth

1 t coriander

S&P

1/2 c chives

Saute onion in oil. Stir in lentils. Pour in broth, add coriander. Bring to a boil, turn down and simmer 1 1/2 hours or till lentils are very tender. Add S&P just before done. Put through blender. When smooth, chill. Serve cold, garnished with chives.