Bring In A "Veggie Grill Virgin" to Veggie Grill Today, Get a Free Meal
Their Facebook page says: "Whisper to the cashier that you've brought in a Veggie Grill Virgin, and we'll comp their entrée.Tell your friend it's on you! ... note: one Veggie Grill Virgin per experienced Veggie Griller please, no solo VG Virgins."
So there you go. Free food for those new to it and free food for those who aren't but are willing to lie.