I have been sprouting cereal grasses and growing the grass for my girls for a while now- it's so easy and they love it. I don't have a lawn or pasture, and since the greens in winter are harder to come by (my vegetable garden cuttings) I feel this is essential.
I sprout a combination of wheat,barley,oat, rye, and flax seeds. When they have sprouted and have little white shoots coming out- I place them in a plastic container with tiny drainage holes and no soil (their roots will begin to tangle and hold it all together) rinsing &draining thoroughly 2-3 times daily. I place in a sunny window after a day or two to turn green and when the grass is about 6" high I begin cutting it and feeding it to them- they gobble it up.
After doing this several times I then chop up the entire plants- seeds/root/leaves and all and they eat the entire thing. When chopping the seeds it creates almost a "milky" substance and they will drink that too. The girls are gorgeous with glossy feathers and they are healthy. It's super easy & since I already sprout for my family it's easy to add another container at the same time. They get this several times a week.
As a side note- This is not their whole diet - it is a "supplement" to their regular diet of layer pellets- plus they get supplemental worm feedings occasionally from my worm bins- they gobble those up too.
