Press one of the "ears" along one of the curved sides of the heart to use as a guide, and score a small line as shown below.
I couldn't even count how many times I've heard my grandmother lament about the same exact problem that, I'm pretty sure, she made up entirely in her head: "It just doesn't taste like my mama's did." ...
Nothing brings me joy quite like browsing the aisles of an antique mall. Every corner of ... and it was one of these weekend outings that brought the cake breaker to my attention.