Into the food processor add egg, egg yolk, freshly squeezed lemon juice, roughly minced garlic, Dijon mustard, sea salt, freshly cracked black peppercorns until the ingredients are fully incorporated.
With the food processor still on remove the cap located in the center of the lid, and little by little begin to add the EVOO.
The mixture will begin to build into a thick consistency. Stop and taste, adjust sea salt and black pepper.
Spoon contents into a small serving bowl.
Add Spanish onion, cilantro, and mix well.
Top with thinly sliced chives.
Serve.