Gathering is really quite simple. Touch an item, and if it is ready to be gathered it will immediately put some of IT in your pouch. Touch an apple,
you get an apple in the pouch (to eat or for cooking). Touch a rare root, you get some of it in your pouch. Touch it again, you get more. All ingredients
in this system have a limit on how much you can gather at one time (as set by the sim owner).