First make the relish: heat oil in a large
frying pan and add the cumin. Let it cook
for a moment, then throw in the bay,
garlic, shallots and chilli. Cook for 2 mins
until soft but not coloured, then add the
celery and tomatoes. Sweat everything
down gently for 20-30 mins until the
tomatoes lose their shape. Remove from
the heat, season and leave to cool. This
can be made a few days in advance and
kept in the fridge.
To make the burgers, mix the egg yolks
in a large bowl with the oyster sauce
and soaked breadcrumbs. Season with
lots of fresh, black pepper then add
the meat, breaking it up a little. Mix
everything, trying not to overwork the
mixture or the burger will become heavy.
Take the mix and divide in half, then
into half and half again so you end up
with 8 even pieces. Roll each one into
a ball and place a 10 x 10cm square of
greaseproof paper on the bottom and
top. Put in the fridge for 15 mins to firm.
Heat a griddle pan. Take 4 burger balls
from the fridge and push them down so
they become discs about the size of a
burger bun, about 2cm thick, between
the 2 pieces of greaseproof. Peel the
paper off one side and slap down in
the pan with no oil or seasoning. Peel the
top layer of paper off and cook on a very
high heat for a couple of mins. In total, a
burger this size will take about 5-10 mins
to cook, but you need a bit of colour and
texture, so exactly how long is up to you.
I turn my burgers after 2 mins, but I cook
on a very high heat, and I like them a little
pink. Keep warm in a low oven while you
cook the rest, topping with the cheese
slices, if you like, for the final few mins
so they melt a little.
Lay the 2 halves of the warm bun
in front of you and butter them lightly.
Spread the mayo on both sides followed
by a little mustard on the top bun and
tomato relish on the bottom. Place a slice
of tomato on the bottom bun followed
by the first burger with the cheese, then
some bacon, then the next burger, more
relish, lettuce and finally the guacamole.
Top with the bun and eat with the
gherkins on the side.