I don't think such an app exists yet, and I don't think there are any Portillo's accepting bitcoin yet.
Yeah. If I thought is was literal, I'd be eating lunch and dinner at Portillo's almost every day just to reward them for making the decision!
Same here
Next time I go to Moto (or ING next door, same chef/owner) I'm going to pitch them. The owner/chef now cooks at ING and has promoted the Suisse Chef to Executive chef, both of these people in to science and technical things, maybe they would go for it.
Hmm, just a little afterthought, maybe some of us Chicago Bitcoiners can go as a group, if they let us pay in bitcoin. For Moto, your looking at about $300/person, maybe 1/2 that at ING, so not for everyone. But they might be more inclined to take BTC for at least one meal if there is a group of us. At least it will get the ball rolling.