An expression signifying that one is especially proud of a batch of
food that they have prepared.
A metaphor, likely originating from the fact that the foot is thought of as dirty, and dirt may equal seasoning, and the toe was used to add this extra "seasoning" to
food. Nobody, of course, literally put their toe into a batch of
food; this expression is purely metaphorical to my knowledge.
Grandson: "Grandmama, this
mac 'n
cheese taste good."
Grandma: "Mhm, I stirred it with my big toe!"
Grandson: "Huh?"