Most of the better restos in Posadas are located along the riverside walk or "Costanera". On one of my daily sunset photo wals I spotted "Itakua" which means "Cave " in Guarany Language.
The place is quite nice and has an outdoor deck with wee to the river, they specialize in pizza but also have a variety of fish and meat dishes, when I was there they had a discount on weekday evenings with 40% off on pizza and drinks, which definitely caught my eye, since I paid less than the cost of a greasy burger, so I wnt there twice and was very satisfied both times.
The place is quite nice and has an outdoor deck with wee to the river, they specialize in pizza but also have a variety of fish and meat dishes, when I was there they had a discount on weekday evenings with 40% off on pizza and drinks, which definitely caught my eye, since I paid less than the cost of a greasy burger, so I wnt there twice and was very satisfied both times.