If you want to follow this advice but don't feel comfortable doing so, here's a trick: when others see you cut a piece of your dessert first, tell them in a joking tone that it's a custom you inherited from your grandmother, who in turn inherited it from her grandmother: when you have been invited to a party and you bring a dessert of your own making, it is customary to consume a piece first in front of the host, to show that it has no poison in it whatsoever. Tell them that your grandmother knew it was ridiculous, but continued to do it as a family tradition (even though you knew she did it so she wouldn't be left without tasting her own dessert). Now you probably have something to start a conversation!