6.
Grill
the
slices
of
Italian
bread
on
both
sides
until toasted,
taking
care
to
not
let
it
burn.
7. To assemble the sandwiches, spread the Horseradish Aioli on 4 pieces of bread. Arrange the sliced steak on top, then cover with the pickled onions and arugula. Finish the sandwich with the remaining toast and slice in half. Serve warm.
Serves 4