Types: Medium Yellow / Premium / Mushroom
A popcorn kernel's strong hull contains the seed's hard, starchy shell endosperm with 14 – 20% moisture, which turns to steam as the kernel is heated. Pressure from the steam continues to build until the hull ruptures, allowing the kernel to forcefully expand, from 20 to 50 times its original size, and then cool.
Two shapes of flakes are commercially important. Butterfly flakes are regarded as having better mouthfeel, with greater tenderness and less noticeable hulls. Mushroom flakes are less fragile than butterfly flakes and are therefore often used for packaged popcorn or confectionery, such as caramel pop corn.