INGREDIENTS
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12 ounces rhubarb (2 to 3 stalks), trimmed
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1 loaf brioche or other soft bread (6 ounces), crusts removed
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8 tablespoons unsalted butter (1 stick), melted, plus more for pan and topping
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1 Granny Smith apple, peeled, cored, and sliced into quarter-inch-thick wedges
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1/2 cup plus 2 tablespoons dark-brown sugar
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1/4 teaspoon ground cinnamon
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Pinch ground nutmeg
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Juice and zest of 1/2 lemon