TheFork users who ate in Lormont have said really good things about Le Prince Noir, Joya and Casa Ferretti - Le Lac. Maybe you should give them a try!
Some of the more popular Truffle restaurants having a terrace in Lormont according to TheFork users include:
Le Prince Noir, with a 9.3 rating
Joya, with a 8.9 rating
Casa Ferretti - Le Lac, with a 9.3 rating