Half working watermill-museum, half unpretentious brick-and-beam pub, Liermolen is a remarkably inexpensive drinking hole with Maes/Grimbergen beer from €1.70/3.20 and delicious Boon Kriek on tap (€2.60). No food is served.
To walk here from the basilica church, pass the 1634 abbey gateway then follow a very pretty pedestrian lane beside the Maalbeek millstream.
The path also continues to Tommenmolen.