Heat the butter and olive oil in a small sauce pan until very warm, about 180 degrees.
In the bowl of a food processor or in the jar of a blender, add the vinegar, lemon juice, salt, pepper, and egg yolks. Briefly process to blend. With the motor running, slowly drizzle in warmed olive oil and butter. *Raw egg warning.
Uniquely... Thoughtfully...Artfully...Gourmet
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