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1
Preheat the oven to 400 degrees.
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2
Line a baking sheet with foil and lightly oil the foil.
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3
Lay the squash on the foil, skin side up, and roast until it is thoroughly tender when pierced with a knife or skewer, 45 minutes to an hour.
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4
Remove from the heat, allow to cool until you can handle it, then remove the skin and puree in a food processor fitted with the steel blade or in a standing mixer fitted with the paddle.
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5
You should have about 3/4 cup of puree.
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6
Sift together the flours, baking powder, baking soda, sugar and salt.
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7
In a medium bowl, beat the eggs and whisk in the buttermilk and the pureed squash.
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8
Add 2 tablespoons of the oil and whisk together.
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9
Heat the remaining oil over medium-high heat in a small skillet and add the slivered sage.
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10
Fry the leaves for about 10 seconds, until they are beginning to crisp, and remove from the heat.
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11
Allow the oil to cool, then add to the liquids in the bowl.
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12
Quickly whisk in the flour mixture.
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13
Heat a griddle over medium-high heat and ladle 1 to 2 tablespoons of batter for each pancake.
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14
They should be about 2 to 3 inches in diameter.
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15
Cook until bubbles break through; flip over and cook until lightly browned on the other side.
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16
Remove from the heat.