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Preheat the oven to 350F.
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Grease and flour an 11″ round tart pan. A tart pan with a lift-off bottom is best.
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Pit the plums and chop into small pieces.
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Roughly chop the pistachios into pieces.
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Chop the marzipan into small pieces.
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Mix the chopped plums, marzipan, pistachios, and plum jam in a bowl.
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Remove the crust from the refrigerator.
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Separate 2/3 of the mixture and press it into the pan to create the crust.
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Sprinkle the breadcrumbs evenly over the bottom of the shell.
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Spread the plum/marzipan/pistachios mixture into the shell.
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Use a teaspoon to distribute small blobs of the pistachio cream over the mixture.
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Distribute the remaining pistachio streusel evenly over the top.
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Bake for 25-30 minutes until the top starts to turn golden brown
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Let cool for 10 minutes.
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Remove the tart from the pan, transfer to a plate, cut, and serve.