It turns out that the fruit I used yesterday was a "sweet lime." Not that that explains the soapiness and general lack of flavor, but when I used an actual Meyer lemon to make tart filling tonight, the result was completely delicious. I'm very happy.
(There's no picture because it's not terribly pretty--I still haven't figured out the trick of making my pie crusts look good.)
(There's no picture because it's not terribly pretty--I still haven't figured out the trick of making my pie crusts look good.)