An idea I came up with years ago, to add nutrition and flavor to homegrown eggs: Foxes made it necessary to keep my chickens enclosed, so to add protein to the feed, I surrounded the fencing with partial sheets of old plywood laid on the ground (with old tires on top to prevent blowing away, and keep good contact with the ground for natural moisture generation and retention). These make a perfect ecosystem for bugs and slugs (GOBS of them). Every day, when I went out for eggs, I'd bring a leaf rake… the chickens went nuts when they saw it… and I'd lift a board and flick a bunch of bugs through the wire. Feeding frenzy as the bugs tried to get back to the darkness and moisture under the wood.
Saved greatly on feed costs… they wouldn't touch the stuff until every bug had been eaten, and the area had been scoured for escapees.
Yolks the color of a late sunset, and rich flavor beyond description.