"From the Momofuku Milk Bar Cookbook by Christina Tosi..."
INGREDIENTS
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1 recipe Mother Dough (see below), risen
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1 recipe Caramelized Onions (see below)
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1 recipe Scalloped Potatoes (see below)
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1 egg
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½ teaspoon water
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1 cup shredded Gruyère cheese (I used white cheddar)