In a bowl whisk together mustrd, sugar, and vinegar until sugar is dissolved and whisk in oil until sauce is emulsified. Whisk in water to thin the sauce to the desired constency. Sauce may be made 1 day in advance and kept covered and chilled. Serve sauce at toom temperature. Makes 1 1/2 cups
The Green Beans
In a large saucepan of boiling slted water cook beans until-crisp-tender, about 6 minutes and drain well.