Gently pull back the husks on each ear of corn, but do not remove. Remove the silk on each and rinse the ears with water.
Brush the corn with butter and sprinkle with salt. Lay three leaves of lemon verbena on each ear. Gently pull the husks back up around each ear of corn. Using kitchen twine, tie the husks at the top of each ear to help keep them sealed. Soak the ears in cold water for 15 minutes.
In a bowl, toss the lemon halves with olive oil. Sprinkle lightly with salt.
Place the ears of corn on the grill and cook for approximately 15 minutes, rotating them every 5 minutes. Grill lemons, cut-side down for 2 to 3 minutes or until lightly browned and slightly tender.
Remove corn from grill and allow to cool to the touch. Peel back or remove husks.
For the Lemon Verbena Butter:
Heat clarified butter to 145 degrees F. Remove from heat and add lemon verbena. Allow to sit for 5 minutes before serving.