If you are looking for a decent cafeteria in Borjomi I can recommend one - Borjomi Cafe 1+2 located close to the entrance of Borjomi park. I paid a visit here and tried different dishes in the middle of September 2015.
Borjomi cafe 1+2
This cafe is located just next to the entrance in Borjomi Park.
Borjomi cafe 1+2
Lovely interior at Cafe 1+2 in Borjomi
Khachapuri and Salads
The bottom line
Although the prices here are about the average, taking into account it's good location and good service this is a place I can recomend once in Borjomi
Location
41.836944, 43.389995