Wash the mussels under plenty of
cold, running water. Discard any
open ones that won’t close when
lightly squeezed or tapped. Pull out
any tough, fibrous beards protruding
from the tightly closed shells and
knock off any barnacles with a large
knife. Give the mussels another
quick rinse to remove any little
pieces of shell.
Melt the butter in a large pan with
a lid. Add the garlic, spring onions,
thyme and bay leaves, then cook
until softened. Add the mussels and
cider, then turn up the heat, cover
the pan and leave the mussels to
steam in their own juices for 3–4
minutes. Give the pan a good shake
every now and then.
Add the cream and the chopped
sorrel or baby spinach and remove
from the heat. Season with salt and
black pepper. Spoon into large
warmed bowls and serve with lots of
crusty bread to soak up the
tasty juices.