Garden fresh tomato soup

This soup is everything a tomato soup should be - fresh and full of flavor.
It's especially good when served with crusty French bread.

4 cups chopped fresh tomatoes
1 large onion, sliced
4 cloves garlic, smashed
2 cups chicken broth, preferably homemade
fresh basil, torn, about 1/2 cup
fresh thyme and oregano, about 1 Tbsp each

3 Tbsp butter
1 Tbsp tomato paste
2 Tbsp flour

salt and pepper, to taste
additional herbs, finely chopped, to serve on top.

Mix together the tomatoes, onions, garlic, herbs, and chicken broth in a stock pot.  Bring to a boil, then simmer gently for half an hour.

Puree this mixture in a blender, then pass through a fine sieve. 

Melt the butter together with the tomato paste and stir in the flour.  Slowly pour in the tomato mixture and whisk so that no clumps will form.  Season with salt and pepper and sprinkle with herbs.