Rhubarb-Elderflower Petit Gateaus

About 5 years ago(which is such a weird preface to say out loud because man, time FLIES), I made a dessert that featured rhubarb and elderflower. Ironically, it featured strawberries as well, so I opted to not even include rhubarb or elderflower in the name of the dessert. The cake itself featured elderflower mousse, and…