Restaurant gst

Restaurant attract 5% rate.
hotel collects gst as per tariff and schedule.

As per Notification 20/2019 CT its 18% with ITC for the Resturant under specified premises.
So it's 18%.

Note : Specified Premises means premises providing „hotel accommodation‟ services
having declared tariff of any unit of accommodation above seven thousand five hundred
rupees per unit per day or equivalent.”.

As per Notification 3/2022 CT (r) 

0 to 7500  its 12% GST

Above 7500 it's 18% GST