1.Preheat oven to hot, 200°C. Lightly grease recesses of a Texas (1-cup) muffin tray.
2.Cut pastry into 6 even squares. Line each recess with pastry. Prick bases with a fork. Bake 10-12 minutes, until puffed and golden. Using a fork, lightly flatten pastry in centres. Cool completely in tray.
3.Meanwhile, cook potatoes in a saucepan of boiling water on high 5-6 minutes, until tender. Drain and refresh in cold water.
4.In a bowl, combine potatoes, tuna, mayonnaise, juice and mustard. Season to taste.
5.Spoon a little into tarts with combined beans, tomatoes, olives and parsley. Accompany with extra tuna mixture.
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