Description:
Because I had nothing better to do. The daughter of Rarity and Big Macintosh. Her special talent has something to do with baking.
Design taken from this fic http://www.fanfiction.net/s/7770003/1/
Name taken from the Macoun, an offspring of the McIntosh apple, very good but it has a short availability and is quite problematic in the growing season. So it’s rare and high-maintenance. It also sounds like the kind of fancy name Rarity would name her daughter.