INGREDIENTS
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200 grams (1 cup minus 2 tablespoons) unsalted butter, diced (substitute almond butter or coconut oil to make this dairy-free)
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200 grams (7 ounces) high-quality bittersweet chocolate, roughly chopped
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180 grams (1 cup minus 2 tablespoons) unrefined blond cane sugar
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4 large eggs
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1 rounded tablespoon flour (all-purpose or other, including any gluten-free flour; can be omitted altogether to make this grain-free)
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fleur de sel or kosher salt, for sprinkling