Found this place on TripAdvisor. The food is mostly meat- pork Belly, chicken thigh, chicken heart, sausages, etc. The only seafood they had was fish, and it was really tough to eat because there were many bones :(
You pick whatever food you want & leave it on a plate. The staff will deliver it to your table when it's done.
Personally I prefer Larsian for the food, but Matias is much cheaper. It worked out to less than $8 per pax inclusive of multiple beers and fruit shakes for a group of 8!