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1
Position oven rack to mid-low position and preheat to 325F (160C).
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2
Choose your baking dish, individual or use an 8 inch cake pan or oval baking dish.
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3
Generously butter the dish or molds.
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4
You will need a roasting pan large enough to hold the molds or baking dish you choose to create a water bath.
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5
Boil about 1/2 gallon of water.
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6
In a medium-large mixing bowl, roughly mix together the sugar, salt and butter until crumbly.
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7
Add the 3 egg yolks and beat well with a wooden spoon.
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8
Add the flour and mix, then add the key lime zest and key lime juice until incorporated.
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9
Stir in the milk.
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10
Beat the 4 egg whites in an impeccably clean mixing bowl using a stand mixer or hand mixer until the egg whites are stiff.
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11
Add the beaten egg whites to the batter and mix together, gently with a whisk (do not fold or you will lose volume) until no large lumps remain.
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12
Add boiling water to the roasting pan and place the molds, cake pan or baking dish into the water bath.
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13
Carefully move into the pre-heated oven.
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14
Bake for 25 minutes, until the top is set and center gently springs back when (gently) touched.
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15
Remove from the oven and let stand for 10 more minutes.
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16
Serve warm, at room temperature or chilled.
