The following page of the guide explains how to unlock the Griddle - an upgrade of the Stagecoach in Darkest Dungeon 2 and which Profile level you need to obtain. You will learn how to use the griddle to create healing Inn Items - Flapjacks.
The Griddle is a special item unlocked at Profile level 2, and it is one of the Stagecoach upgrades. It allows you to create Flapjacks during Expeditions. This way you will be able to get a healing item which you can use at an Inn. Flapjacks spawn randomly every given distance traveled with the Stagecoach.
It's not a common collectible: sometimes you'll get it as a quest reward during an Expedition, or you can look for it at the Hoarder's. Thanks to Flapjacks, you don't have to collect other consumables in your inventory, especially the poor ones - such as Slime Molds.