1 tablespoon crystallized ginger
1/2 cup packed light-brown sugar
1/4 teaspoon ground allspice
5 slices white sandwich bread (4 ounces), coarsely torn
4 mangoes (4 pounds), peeled, pitted, and cut into 3/4-inch pieces
2 tablespoons fresh lemon juice
2 tablespoons unsalted butter
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