Excellent!!!! Sweet, sour, and salty - definitely will make again. Nice to see tarragon used outside of fish applications and a great use of extra rhubarb from the yard or farmers market. Different from the recipe, I grilled the chicken outside and made the sauce on the stovetop separately. As a result, rather than using oil and chicken drippings, I started with a tablespoon of butter in the pan before adding shallots to soften and then the stock and vinegar followed with the end steps staying true to recipe. Easy and delicious!