Preparation Mince and mash garlic to a paste with 1/4 teaspoon salt. Cook Sherry, vinegar, mustard, shallot, garlic paste, and sugar in a small saucepan over medium-low heat, whisking, until heated through. Add oil in a slow stream, whisking until emulsified. Toss greens with warm dressing. Serve immediately. Cooks' note:Dressing can be made 1 day ahead and chilled. Heat through before tossing with salad.
Preparation Mince and mash garlic to a paste with 1/4 teaspoon salt. Cook Sherry, vinegar, mustard, shallot, garlic paste, and sugar in a small saucepan over medium-low heat, whisking, until heated through. Add oil in a slow stream, whisking until emulsified. Toss greens with warm dressing. Serve immediately. Cooks' note:Dressing can be made 1 day ahead and chilled. Heat through before tossing with salad.