Once I got back to my home kitchen, I was determined to prove that my improved macaronage and troubleshooting from previous macaron bakes were the culprits of my issues with this pastry. So I made a batch of macarons, intending to fill them with a rhubarb and ginger white chocolate ganache.
Suffice to say, white chocolate behaves significantly differently than other types of chocolate, and my ganache was an utter failure. Basically, the lack of cacao content means that it sets softer and in general requires far less liquid to make a ganache; my resulting ganache, based on a recipe for dark chocolate, was way too liquid. But I baked up a batch of the macaron shells anyways, figuring I'd find some other type of filling for them the next day when I was less frustrated.