I have been to this restaurant on business trips 2x in the past 6 months. It is sublime and I must recommend it to anybody who is near Mangualde. I suspect, but cannot confirm, that it is primarily a lunch space. Do not be deceived by the entrance, a small room with a lunch counter, there is a proper restaurant space inside.
The food is unpretentious and delicious. In spring, I had a wild boar stew and last week had veal with baker's style potatoes and cabbage. Very simple but magical. For dessert I've had a creme caramel type custard (served from a giant bowl) and pumpkin jam with fresh cheese. I want to move to this part of the world and eat here weekly if not daily.