Prepare your fish for battering. Slice
the fish into at least six finger-size
strips. For the beer batter, whisk the
flour, salt and lager in a bowl until
combined. Fill a large frying pan
with about 2.5 cm of oil over a high
heat, but don’t leave this unattended.
When the oil is bubbling steadily, it’s
ready to go.
Dip the fish fingers in the batter,
remove any excess and then lower
carefully into the oil using tongs if
necessary. Fry for about 4 minutes on
each side over a moderate heat until
golden and crispy. Remove the fish
fingers carefully from the oil and drain
well on paper towels. Season with
sea salt.
Mix all the ingredients for the
tartare sauce together in a mixing
bowl. Lay one slice of bread down
and butter it, then spread a couple of
tablespoons of tartare sauce on top.
Add 3 fish fingers, then a few strips of
lettuce and top with the second slice
of bread. Serve with fries, if you like.