you add green to it
Jelly is made from pork. Jelly as in "PB&J" is a fruit preserve, being fruits, usually in a rather mashed state, being mixed in with preservatives that create a long-lasting spread with fruit...
Jellies are a mixture of fruit juice, sugar, and pectin, are clear and bright with a tender but firm texture
the amount of jelly in a doughnut depends on how big the doughnut is
It's injected using an icing bag, or similar type injector.