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Preheat the oven to 350° and move rack to the centre
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Remove crust from refridgerator a few minutes ahead of time or while preparing fruit filling (step 4)
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Place disc onto a sheet of parchment paper and roll out to about 14". You want the crust to be fairly thin and you need enough diameter to cover the filling edges
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Mix all plums through lemon zest in a large bowl until sugar begins to stick to fruit
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Pile fruit into centre of crust and spread to about 2" from edge of crust
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Gently fold edges of crust up and around the fruit filling, overlapping as needed
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Brush the edges of the crust with a bit of the remaining egg white and sprinkle with coarse sugar if desired. This isn't necessary but it's pretty!
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Carefully slide the crust, still on the parchment paper, onto a baking sheet and place into 350° oven on the centre rack for about 55 minutes until crust is nicely golden and filling is juicy.