Bring vinegar, wine , shallots, and tarragon to boil in small saucepan over medium-hgh. Boil until most liquid evaporates, about 5 minutes. Off heat, add water, then whisk in yolks until frothy. gradually drizzle in butter, whisking constantly to incorporate. Sauce should be thick, but thin it with a little water if needed. If it's too thin, return to low heat and whisk until thickened. Strain sauce through medium strainer into cup. Season with lemon juice, pepper, and salt.