Today I have made Bearnaise Sauce with Prawns. Worked out perfectly!
I used 500g whole green prawns and shelled them myself as I find they have more flavour than the ones already peeled. I would just go with how many you want to serve on top of each steak and buy that amount as it makes plenty of sauce.
The sauce was at just the right consistency, not too thin and not too thick and the flavour was spot on in my opinion, nothing over powered.
As this was just for 2 of us today, I have vacuumed packed the remainder of the sauce for another time.
Linked JD