There are various kinds of Salted Caramel Profiteroles. A quick google search will tell you that many of the major supermarkets sell them. Mostly they are small and essentially typical profiteroles but with salted caramel added. And surprisingly cheap . At the end of the post you can see some examples.
Staying at The Curtain Hotel in Shoreditch in the buffet lunch was a rather different version. The outside is crusted and a little crunchy with the base being typical choux pastry . They tasted delicious and for the bakers out there maybe worth making . Size wise they were like small doughnut size and one was plenty! Cannot be certain but suspect they are homemade .