"As in 60 seconds. And it's foolproof...."
INGREDIENTS
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1 wide-mouth pint-sized mason jar
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1 egg, at room temperature
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1/2 teaspoon ground mustard (or a dollop of Dijon mustard)
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Kosher salt, to taste
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juice of 1/2 a lemon
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1 cup neutral tasting oil, such as safflower or sunflower