Not only male fans of manga and anime culture with waifus do strange things from time to time, since recently a trend has emerged on TikTok in several Asian countries (especially Japan) among the female audience, which consists of putting merchandise of her husbandos (whether real, as idols, or fictional, as anime characters) within their meals to "make them tastier."
The trend still appears to be growing, but it will surely be a matter of time before it catches up to the West. However, it is not advisable to put merchandise inside the food, since there are already products aimed at the female public dedicated to this type of use, even if you do not believe it.
It is worth noting that this could be considered as something "relatively normal" considering the kinds of things that anime fans (whether male or female) can get to do for their favorite characters. The following images without context are a perfect example.