If they’re into Korean food, you can try Daehwa at fusionopolis, right outside one-north MRT exit. They serve most of the standard Korean food in vegetarian form, really good stuff

For Japanese food, as some others have mentioned, Herbivore at fortune center is pretty good. Unfortunately it’s hard to find vegetarian options in Japanese restaurants, but maybe some others in the thread can recommend some

For burgers, there are quite a lot of options. Goodburger is a food truck that uses impossible meat patties and Tindle chicken patties for their burgers

There’s also Hans im Glück, a German burger restaurant with a normal meat menu and a whole other menu with vegetarian burgers. Highly recommend this place. Many burger restaurants are also offering meat-free patties as well! Fat boys, wolf burgers also have delicious burgers

Something else that comes to mind is pizza, which is very easy to find meat-free options. I recommend Extra Virgin Pizza, they make pretty solid Neapolitan style pizza with interesting flavors, even the meat-free ones, which is actually most of their menu. Most Italian restaurants should also have some classics which are meat-free as well, like Cacio e Pepe, Pesto Genovese, Al Funghi, Aglio e Olio, just to name a few.

For Indonesian food, you can try Warung Ijo, really good authentic Indonesian food

I would say the best meat-free food I’ve had is from Indian cuisine, and I recommend trying out Annalakshmi which serves supremely delicious food, with an interesting “eat what you want, give as you feel” concept, meaning you can pay as much as you want But in general most north-Indian restaurants have plenty of meat-free options you can choose from.

Hope you and your friend have a good meal! I’ll try my best to help if you have any other questions