A couple of weeks ago, lion fish burgers from the truck were $17.50 per, actually two on small buns (think sliders). That pair would give two people the idea, but not be lunch. Cactus Blue, which sells them, parks at North Belnem/Corporal Meiss. The good news about the price is that (we were told) lion fish meat is selling @ $50/kilo, as the local population is being drawn down. The bad news is the price, of course, but it is certainly tasty; also recommend the lion fish pizza as Pasa Bon, now located in town--artichoke hearts, capers, and other good stuff as I recall. In addition to the other recommendations here, although not a truck, Beer & Burgers, a place a mile or so east of downtown, lives up to its name nicely. Plenty of good food on Bonaire!