In a bowl, combine the egg yolks, vinegar, lemon juice, salt, pepper, Tabasco, and Worcestershire. Blend with a whisk. Gradually add oil, a drop at a time, whisking constantly. As mixture begins to thicken and looks like mayonnaise, you can add oil more generously. Adjust seasonings and store in refrigerator as long as 4 days.
In a blender, combine scallions, sour cream, and lemon juice. Pulse a few times to combine, then puree until smooth. Add salt, pepper, tomatillos and 1/2 cup of the Mayonnaise. Blend just to combine.
Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.
c.1997, M.S. Milliken & S. Feniger, all rights reserved