TheFork users who ate in Ghent have said really good things about Giuseppe's Pizza Forno a Legna, Midtown Grill Gent and Fewa. Maybe you should give them a try!
Some of the more popular European restaurants that offer vegetarian options on their menu in Ghent according to TheFork users include:
Giuseppe's Pizza Forno a Legna, with a 9.1 rating
Midtown Grill Gent, with a 8.9 rating
Fewa, with a 7.8 rating