Home cooking?

Hi

I've come across this passage in a NY Times article today on the women figure skating event:

"How did Shekhovtsova vote? It is impossible to know because judges’ scores are made anonymously. Perhaps she is the most honest judge in the world. Maybe she placed Sotnikova fifth in a vote of conscience and independence.

We cannot know, which leads to doubt and suspicion of favoritism and home cooking in a subjective sport with a tainted history of collusion. That is unfair to both Shekhovtsova and Sotnikova and diminishes the value of the gold medal."

I suppose "home cooking" here is just another way of saying nepotism (i.e. you serve your own family when you cook at home) but I can't find it in any of the dictionaries I use. Is this a common usage?

Thanks.