The business started in the home of newly-immigrated Mr. Big and his Grandmama, which was constructed from a box. It quickly became popular and established itself as part of Zootopia's community with the help of Mr. Big and Koslov delivering cannolis around the city.
It was briefly raided by the Rhino Boss, but after his defeat, the bakery expanded, and Grandmama was eventually able to afford to set up a proper building to sell her goods.