Thanks! Precise as always.

I'm not sure if it's the best way to do so, but it worked for me by
using a lambda:

(setq citar-file-open-function '(lambda (file)
          (async-shell-command (format-message "sioyek \"%s\"" file))))

Moreover, since I don't really care about the terminal output of the PDF
viewer, I followed an Emacs SE suggestion
(https://emacs.stackexchange.com/a/58341/29817) and made the output
buffer not brought up:

(add-to-list 'display-buffer-alist '("*Async Shell Command*"
display-buffer-no-window (nil)))

which, in case I want to inspect it, it's still visitable with the usual
C-x b.

Thank you!

Alessandro

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