Tensei shitara Slime Datta Ken Bishokuden: Peko to Rimuru no Ryouri Techou

The spinoff manga centers on a wounded goblin slayer warrior named Peko, a name given by Rimuru. Along with the new name, Rimuru gives Peko a new command: make everyone happy with a full stomach. Novice chef Peko's new challenge in the kitchen begins.

(Source: Kodansha, translated)