[runnerveggie]

Here's an idea to leave this on a positive note - maybe you could write to the restaurant (or leave a comment card if it is nearby) and let them know you're glad they have a vegetarian option, but they could reach a larger population if they switched to a vegan veggie burger (Gardenburger does have a few vegan varieties, as well as Boca or Amy's). This would cover vegans as well as lactose-intolerant and possibly milk allergic people. There might not be much of a chance that they'd take you up on it, but it's worth a try.