1Combine carrots, celery, shallots, thyme, salt, pepper and wine in saucepan. Bring to a boil, Cook, uncovered, over low heat for 10 minutes. Add broth and cook 10 minutes longer. Strain the sauce. Knead one tablespoon of butter and the flour together to make beurre manie. Stir it into the sauce a little at a time. At the last minute, stir in the other tablespoon of butter and taste for seasoning.