The New York Times reports that the White House has yielded its first harvest.  The peas and greens are no surprise.  My own broccoli hasn't come in yet, but that's due to rabbits more than anything else.  It's the "one cucumber" that surprises me.  That's got to be one early-ripening cucumber, even down there in Zone 7 with a staff of full-time gardeners.  The article also lists the specific lettuces they've been growing, and at least two of them, red oakleaf and lolla rossa, are heirloom cultivars.