That's something I've been paranoid about in the past, too. When I would go to a restaurant that served meat-like veggieburgers, I'd usually be with my mom--and I'd take the bun off the patty and ask, "This isn't meat, is it?" LOL. She ate meat for far longer than I did so I figure she'd be able to recognize it more easily. She probably got sick of that!
I'd also use a repetative style when ordering at Denny's, etc. "I'll have the Boca veggieburger." I figured if they don't understand "Boca" they might get "veggieburger".
slops, gloops, and gruels.