Arugula Mayonnaise

Directions

1. 1
   In a small bowl, whisk together egg yolk, mustard, vinegar and large pinch of salt.
2. 2
   Beginning a drop at a time, whisk in oils.
3. 3
   As it emulsifies, add oil a little faster in a slow, steady stream.
4. 4
   When mixture is thick, taste, and adjust seasoning.
5. 5
   It should be highly seasoned.
6. 6
   Transfer mixture to a blender or food processor, add arugula, and puree.
7. 7
   (Add a tablespoon of water, if necessary, to get arugula flowing.)
8. 8
   Taste, and adjust seasoning before serving.