There's only been a dozen or so installs of Talk Dim Sum on Google Play so far, but that's enough for someone to send me a good bug report: the speech recognition feature wasn't working on Android 11.

I found a flutter fix after some furious googling, verified by the user (the Android Studio emulator is not so cooperative). So now if you're running a fairly new phone with Android 11, you can practice pronouncing dim sum dishes (and a lot more, for example, mapo tofu below is a popular Sichuan dish).