1. Cook first 2 ingredients in boiling salted water to cover 3 minutes; drain. Plunge into ice water to stop the cooking process; drain.
2. Process tomatoes, tomatillos, green onions, and next 7 ingredients in a blender until smooth. Pour mixture through a fine wire-mesh strainer into a pitcher, discarding solids. Serve over ice. Garnish, if desired.
*Tequila may be substituted.
Note: We tested with Tabasco Green Pepper Sauce.