01 -
1 1/2 pounds of shrimp, shells on.
02 -
A small onion, chopped (makes about 1/2 cup).
03 -
2 big spoons of sea salt, and a bit more for boiling.
04 -
1 pound of creamy butter.
05 -
Zest and juice from 2 lemons.
06 -
1 small spoon of Worcestershire.
07 -
A big handful of dill, finely chopped.
08 -
A big handful of parsley, chopped fine.
09 -
A healthy pinch of black pepper.
10 -
Just a pinch of celery seeds.