If someone is eating a mezonot food in the Succah, and forgets to say leisheiv basucah, (when) should they make it up?
Say it right now? Just skip it? Make a bracha achronah and restart the meal?
Mishna B'rura 639:48 says to say it as soon as he remembers so long as he's still at his meal and that, if he hasn't yet said his b'racha acharona, he should eat more thereafter; it seems to me to imply that, if he has already said his b'racha acharona, he should sit around awhile after "leshev basuka".