Continuing the rap-as-drug metaphor, you “cook up” the Roc-a-fella “package” by taking bits of the team’s best talent — Jay, Freeway, Beanie, and Kanye
The “brick of ‘Ye” contains a pun-within-the-metaphor, as it can also be heard as “a brick of yay” — i.e. yayo, or cocaine (“brick” is slang for a kilo of coke)
Eminem has similar lines in Patiently Waiting.