...On the first day of tapping, the sap is too sweet; it is best during the following week and, when it becomes tart, no more must be drawn or the tree will be injured... 
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...This jaunt had given them an appetite, and roast beef and apple tart disappeared at a rate that should have doubled their bill...
Various 「Ainslee's, Vol. 15, No. 5, June 1905」
...It is a very pleasant tart fruit, and has a pretty large flattish stone in the middle...
William Dampier 「A Voyage to New Holland」
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