"Classic Shoo Fly Pie is perfection in both texture and flavor. It's not hard to make, sets up to a barely woogly center, and the crisp, crunchy-yet-sandy streusel is a fantastictopping. The streusel that is baked in with the filling helps it to set up as the starches in the flour gel. It's a genius pie for lean times and not so lean times. I do hope you give it a try...."
INGREDIENTS
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1 9:" pie shell (not deep dish), docked and frozen* (See Note)
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4.5 oz (about 1 cup) all purpose flour
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4.7 oz (about 2/3 cup, packed) dark or light brown sugar
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3 Tablespoons cold, unsalted butter
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9 oz (3/4 cup) molasses
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4.5 oz (1/2 cup plus 1 Tablespoon) hot water
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1/2 teaspoon baking soda
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heavy pinch kosher salt (about 1/4 teaspoon)
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1 large egg, beaten