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1
Preheat a broiler.
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2
Slice the steak into 1/4-inch thick slices.
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3
Slice the cheese into 12 pieces.
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4
Set the rolls, cut side-up on a baking sheet and toast under the broiler.
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5
Set the tops of the rolls aside.
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6
Slather the bottom halves of the rolls with half the mustard and top with the slices of steak, overlapping them slightly.
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7
Season with salt and pepper.
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8
Cover with 2 slices of cheese.
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9
Broil the open-faced sandwiches until the cheese is lightly browned and melted, about 1 minute.
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10
Transfer the sandwiches to the work surface.
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11
Top each sandwich with an equal portion of the roasted shallots and about 3/4 cup of the watercress.
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12
Slather the tops of the rolls with the remaining mustard and cover the sandwiches.
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13
Slice the sandwiches in half crosswise.
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14
Serve immediately.
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15
Preheat the oven to 400 degrees F. In a large bowl, toss the shallots with the oil and salt, and season generously with pepper.
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16
Transfer to an aluminum foil-lined baking sheet and spread out in a single layer.
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17
Bake until the shallots?
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18
skins are somewhat charred and crispy and the flesh is very tender, about 40 minutes.
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19
Remove from the oven and allow to cool slightly.
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20
Using a knife, slice off the tips of the shallots (the end opposite the root end) and discard.
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21
Gently squeeze the shallots from their skins and season with salt and pepper to taste.
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22
Serve with roasted beef, chicken, or on steak sandwiches.