Re: Which grains double in size when they are cooked or sprouted?..also sprouting tip
I soak whole grains overnight and some of them appear to double in size. One is "oat groats" which is the most natural form of oats. The only place I can find it is in a health food store. It might seem expensive but if you measure just 1/4 cup dry each day, one bag will last a long time. After it's cooked I mix it with fruit and a small amount of chopped nuts.
Another one is whole wheat berries. I soak 1/4 cup overnight and it seems to double too. Then I use the whole wheat berries to make soup.
Whole grains contain phytates like beans so that's why I soak them overnight. After soaking, your drain and rinse.
Barley is another one that I soak overnight and it appears to double too. Barley is very good for your health as it is high in fiber, among other things. And I think it is reasonably priced. Lately I have been mixing whole wheat berries with barley. I store them dry in one container. Then when I take 1/4 cup for soaking, I automatically get an equal mixture of both.
If you're on a tight budget, you might try mixing 3 items as follows: 1) whole grain rice 2) whole wheat berries and 3) whole grain barley. Rice is very inexpensive campared to the others and it will serve the purpose of stretching them. So you'll get a little of everything without breaking the bank.
The oat groats can be used alone for breakfast (or try mixing with barley). Actually, you can have any of them for breakfast. I just happen to prefer oats.