One of Tomar's fun experiences, where old meets new. Housed in a former adega (winery), the eatery is lined with wine vats. As grain was once here too, it used to attract rats (thus the name), but besides the jokey ones you'll see hanging off electric wires, you'll see nothing but delicious share plates and good wine.
The owner also serves the same menu at the more contemporary Casa Matreno, which is located diagonally opposite from Casa das Ratas.