Mexican Spiced Tomato Soup

This is a recipe from "Enjoy" by Sophie Gray of Destitute Gourmet fame. I am posting this for Judy. Hi Judy!!

2 tablespoons olive oil
2 onions, chopped
3 cloves garlic, chopped
3 teaspoon mexican seasoning *
2 x 400g cans chopped tomatoes
6 cups beef stock
1/3 cup tomato paste
1 1/2 cups red lentils
2 tablespoons brown sugar

In a large saucepan, heat the oil and add the onions and garlic. Fry until soft and golden.
Add mexican seasoning and stir around for a minute, then add the tomato paste, tomatoes, stock, lentils and sugar.
Bring to the boil and stir and then reduce heat and simmer for 45 minutes.
If you like it smooth, puree with a stick blender or the food processor, but I don't mind it the way it is. A dollop of sour cream is nice in this.