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In a small non-reactive saucepan combine blueberries, sugar, salt, lemon zest and lemon juice.
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Cook for 5-7 mins over medium heat, until the blueberries begin to burst and the sauce begins to thicken.
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Remove, cool to room temperature and then chill in refrigerator.
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Pour heavy cream into a large bowl and whip until soft peaks are formed.
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Add confectioners sugar and vanilla extract and whip until stiff peaks are formed.
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Fold chilled blueberries into whipped cream, holding off about a half cup to drizzle over the top.
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Scoop into serving cups and drizzle with reserved blueberries and top graham cracker crumbles if desired.