Faki Soupa (Greek Lentil Soup)

3/4 cup brown lentils
1 large onion, sliced
2 cloves garlic, crushed
1 (3 ounce) can tomato purée
8 ounces fresh tomatoes, peeled and seeded
Good pinch of oregano
2 tablespoons olive oil
3 3/4 cups water
Salt, to taste
Pepper, to taste

Cover lentils with cold water and bring to boil. Drain lentils and return to the pan with 1 1/2 pints water, garlic, onion, tomato purée, fresh tomatoes, oregano and olive oil. Bring to a boil and simmer until the lentils are soft. Remove from heat and blend, but stop blending before the mixture gets too smooth. Season to taste.