I've come across a couple of people who write that if the flesh has tiny black specks in it then it doesn't need to be mushy before you eat it, and you can see that these do. (occasionallyeggs.com)
The vanilla bean adds a delicate vanilla flavor and aroma to the sauce, plus it fills the sauce with beautiful little black specks of fresh vanilla. (celebratingsweets.com)
According to the ASPCA, the presence of little black specks may be flea dirt, indicating that your dog is hosting a flea family. (petsprinciple.com)