Preheat the oven to 450 degrees F.
Place the peaches and plums snugly in a single layer, cut side up, in 2 glass or porcelain oven-proof baking dishes. Sprinkle with the sugar, and then top with the raspberries. Bake for 20 to 25 minutes, until tender.
Heat the broiler and place the fruit about 5 inches below the heat and broil for 5 to 8 minutes, until the berries release some of their juices.
Remove from the broiler and sprinkle with orange juice. Serve warm, at room temperature, or chilled.
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