So, there are two ways to go. Much deeper, or a bit wider.
Deeper would mean a bacon-focused buffet, a dozen bacon dishes, including chocolate-covered bacon. Deeper would mean a chocolate-obsessed dessert bar, ten cakes, fondue, everything.
Deeper gets you people willing to drive across town to visit you. It’s remarkable. It’s not like every other buffet but a little bit bigger. It’s insanely over the top. People will bully their friends in order to get them to come.
The other choice is wider. Instead of adding a handful of dishes that mildly please the people you already have, why not add brown rice and tofu and vegetarian chili? Now you’ve opened the doors to that last 15%.