Corsendonk Pater and Ename dubbel.

These two beers are excellent. They are both dubbel (they have two grains in the list of ingredients) and are fermented in the bottle.
They both have a sweet taste, not too bitter just perfectly enjoyable. Corsendonk pater has 7.5 % of alcohol, and Ename dubbel has a nice 6.5 %. Therefore they are both in the not that dangerous zone in which you can enjoy a couple of beers without getting too drunk.

If you come to Belgium these two beers are definitely a good option.