Despite her character's love of chocolate, actress Marina Sirtis was concerned that filming these scenes would adversely affect her weight. As such, she asked the producers to use milk chocolate (which she disliked), and spit the ice cream into a bucket off camera after each bite.
Wish there was some pics or footage of this silliness.
I thought that was pretty standard for actors depicting a character eating. I remember how Aziz Ansari found it notable that Chris Pratt did not do so on Parks and Recreation:
He always also never uses a spit bucket. When you do scenes where a character is eating, you eat and then spit it out into a "spit bucket." Chris just keeps eating. If you see Andy eating a cheeseburger in a scene, you should know Chris Pratt ate like 8 cheeseburgers.