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- 2 tablespoons (30 g) butter
- 2 small yellow onions, finely chopped
- Add the butter and chopped onion and celery to a large saucepan. Cook and stir over low heat until the vegetables are soft, 5 to 7 minutes.
- Add the tomatoes to a large mixing bowl. Add the salt, black pepper, basil, and parsley. Mash the tomatoes and seasonings a bit with a wooden spoon.
- When the onions and celery are soft, add the chicken broth to th