Welcome to the Outcast's Restaurant! Vol. 3 (manga)

A DISH BEST SERVED COLD
 

All Dennis ever wanted was to serve tasty food to hungry customers, but because he defied the powers that be, his beloved restaurant was burned to the ground. As he sinks into the depths of despair, the people he'd saved with his cooking appear to support him.

With the same knife he uses to slice up veggies, Dennis will now go forth to dice some evildoers!