Caramelized citrus?

Adding citrus to beer is nothing new, but has anyone ever caramelized the citrus before adding? I’m thinking that it might add a new twist.
Opinions?

I put a pineapple on the grill before I pureed it.  Turned out ok.

I was thinking some caramelized blood orange might work well in an red: impart some citrus-toffee notes.