INGREDIENTS
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2 1/4 sticks unsalted butter, room temperature, plus more for pan
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1 1/2 cups (6 ounces) pecans
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1 cup (4 1/2 ounces) salted cashews
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1 cup (5 ounces) salted peanuts
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3/4 cup packed light-brown sugar
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2 1/4 cups all-purpose flour
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2 1/2 teaspoons plus a pinch of salt
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4 cups granulated sugar
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1/2 teaspoon cream of tartar
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1 cup heavy cream