Blender Green Mayonnaise

* Such as parsley, watercress, or baby spinach leaves

Place the greens and the herb with the egg, egg yolk, and pepper in an electric blender or food processor and blend until the greens are pureed.

Start adding the oil in a slow, thin stream until the mixture becomes too thick, then add the lemon juice and continue until all the oil is used up. If it's too thick, add a small amount of boiling water.

Taste, then refrigerate in a covered bowl or jar.

NOTE: This must be used within a few days; after that the greens tend to turn sour. If you plan to keep it longer, blanch the greens for a minute in boiling water, then squeeze dry before using.