On the riverside near the Assi Bridge (Jisr al-Assi) and close to the Dardara Waterfalls are several (outdoor) restaurants, serving fresh trout from the river. The Chahine Paradise Island  is a good option.

Assi bridge
Hermel
+961 (0)8 200 685

  

Check the map below for an overview of all Food & Drinks locations across Lebanon.