Grasshoppers are an efficient source of protein and really easy to farm. If properly prepared they also taste really good. Worms can also be made into a replacement for burger meat as well as eating all your compost turning to into soil at the same time (and if one knows what they are doing can also produce and collect natural gas from the compost) which would finally give a use to all that rotten food. Eating bug based should have a negative happiness affect at first because of the stigma that would decrease each time they eat it.
Farming grasshoppers is pretty easy, and they can eat many veggies and even just plain grass clippings:
Cooking them is also really easy. In mexico the are a popular ingredient, even more expansive than regular meat due to popularity despite the ease of farming. http://mexicanfood.about.com/od/authenticfamilyrecipes/r/chapulines.htm