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Makes 4 Burgers
To make the mayonnaise, combine all of the ingredients in a small
bowl and whisk to blend well. Cover and refrigerate until serving.
To make the patties, with a large chef's knife, cut the salmon
into strips. Cut the strips crosswise, then chop until the salmon
is the texture of raw hamburger meat.
Transfer the salmon to a large bowl and add the bread crumbs, anchovy-water
mixture, shallot, lemon juice, mustard, and pepper. Handling the
salmon as little as possible to avoid compacting it, mix well. Divide
the mixture into 4 equal portions and form the portions into patties
to fit the buns. Cover and refrigerate for about 30 minutes.
Meanwhile combine the onion and vinegar in a bowl and toss well.
Set aside for about 30 minutes, stirring often.
Prepare a medium-hot fire in a charcoal grill with a cover, or
preheat a gas grill to medium-high. When the grill is ready, brush
the grill rack with vegetable oil. Place the chilled patties on
the rack, cover, and cook, turning once, until just opaque throughout,
about 2 minutes on each side.
During the last few minutes of cooking, place the buns, cut side
down, on the outer edge of the rack to toast lightly.
To assemble the burgers, spread the mayonnaise over the cut sides
of the buns. On each bun bottom, place a few spinach leaves, a patty,
and an equal portion of the onions. Add the bun tops and serve.
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