Mortadella Sandwiches with Pistachio Mayonnaise

Instructions

1. 1

   In the tall, narrow container of a hand blender, combine the egg, pistachios, lemon juice and garlic. Using a hand blender, purée the ingredients until smooth. With the machine running, slowly drizzle in the oil. The emulsion will begin to form a mayonnaise in less than 1 minute. Season with salt and pepper. The mayonnaise will keep for 1 week in an airtight container in the refrigerator.