When a speaker briefly interrupts their own dialogue, then resumes in the same paragraph, how do you punctuate the interruption?
I know that, when it doesn't halt speech (i.e. dashes outside quotes), you use lower case and no full stop. Like so:
"Well I heard"—her voice dropped to a whisper—"that she stole it."
But what if speech is halted (i.e. dashes inside quotes)?
Which of these is right?:
"It's good, but—" He took another bite. "—it could use more salt."
"It's good, but—" he took another bite "—it could use more salt."
[Please no examples where the interruption is by another person, or there's a paragraph break. That's a slightly different situation (with lots of answers already) and not helpful.]
[ETA: It's been pointed out that "it could use more salt" could be considered a separate sentence, thus avoiding the issue. As I'm specifically looking for the right punctuation (capital and full stop? yes/no?) for an interrupted full sentence (and not just this sentence in particular), please pretend that it can't.]