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1
Toss together cherries, sugar, and cornstarch in a medium bowl.
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2
Set aside; let cherries thaw slightly, about 35 minutes.
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3
Preheat the oven to 350F.
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4
Using a pastry brush, generously brush one side of each slice of bread with the butter.
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5
Reserve 6 slices; cut remaining slices in half to form 36 rectangles.
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6
Line sides and bottom of each cup of a jumbo (6-cup) muffin tin with 6 rectangles, overlapping bread and placing buttered side against tin.
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7
Toss cherry mixture to combine.
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8
Spoon into bread-lined cups.
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9
Top each with a reserved bread square, buttered side down; press firmly onto cherries.
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10
Bake charlottes until tops and sides are golden and crisp, 35 to 40 minutes.
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11
Transfer tin to a wire rack; let stand until charlottes have cooled slightly and are just firm, 15 to 20 minutes.
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12
Using an offset spatula or knife, loosen sides of charlottes from tin, and unmold; invert onto serving plates.
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13
Serve warm, with warm sour cherry compote on the side.
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14
Put cherries, sugar, and vinegar into a small saucepan.
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15
Cook over medium heat, stirring occasionally, until cherries have burst and mixture begins to thicken, about 10 minutes.
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16
Serve warm.