We have a winner - but you are from Brazil so that gives you an advantage. These are indeed cuy which are apparently a delicacy in Ecuador. Most simple meals (chicken, rice, and salad) are around $3 but cuy was $17.
For those not familiar with cuy (as I was) - let me just say that those are particularly large guinea pigs.
Heading back to Lake Ontario for this summer. Relatively few stops along the way from Grenada. Martinique, Guadeloupe, St. Martin (must have something to do with the French food), then Bermuda, New England and up the Hudson/Erie Canal. We were going to go via Newfoundland and Labrador but June remembered that one of the kids is getting married this summer - details, details!