How to avoid lunch habit

Hello! I've been on and off intermittent fasting for 2 years now but this time I want to be consistent. I'm doing a 18hr fast, but he issue is, I have AN HOUR lunch break on my job, everyone eats at the time, (which is not even close to the 18hr mark). Up until a month ago I went with my colleagues, so I had created a habit, eating and chatting with coworkers and having a nice and relaxing time. I tried to break it a month ago when I started fasting. So instead of going with them to eat, I tried going for a walk or just watching videos or do something to entertain myself. It's not working 😭 😭, I either feel miserable the whole time thinking about food or cave in and buy a salad and eat it. I'm really struggling with it, I've caved like 6 times and it really affects my progress :( how can I avoid feeling the craving? because it's not hunger, it's literally craving and habit. How can I suppress those feelings so I don't cave in?