Gallant Gerald Gregory went up to Granny's garden
To get green and grey herbs for his mother's stew.
Gallant Gerald Gregory grew those herbs himself
In Granny's garden, to be sure, cause he has none himself.
Gallant Gerald Gregory picked herbs green and grey
And after that he just went  home, he did not stop to play.
Gallant Gerald Gregory's grimy hands were washed
Before he guzzled mother's stew with green and gray herbs.
Gallant Gerald Gregory really liked the stew.
Everything is better when you've eaten up your stew.

Count the g's if you want. There's exactly thirty.