Don't start grinding this until after you have completed the
Camp Fire Cookoff DLC campaign. My tracker was at 39% once I had finished getting 3 stars on every level.
I would also suggest not grinding this out until after you have unlocked
Tree Hater, since if you use the level 2-3 to grind chopping and burning wood, you have to pull it from a backpack.
If you still need some after unlocking
Tree Hater, simply load up any level with a back pack and after one chef equips it with
, get the other chef/chefs to start grabbing items out of the backpack and tossing them across the level with
. If you get into a grove you can throw out hundreds of items in a matter of minutes. (levels with backpacks are 1-3, 2-2, 2-3, etc)