Preheat oven to 175 °C.
Dice the butter into all the ingredients for the sweet pastry. Lightly work the dough together on a floured surface. Cover with cling film and refrigerate for approx. 30 minutes. Press the pastry into a rectangular springform baking tin, about 13x36 cm.
Bake the pastry shell in the centre of the oven for about 10 minutes. Meanwhile, prepare the filling. Beat all the ingredients into a smooth mixture.
Pour the filling into the pastry shell and bake in the centre of the oven for a further 15-20 minutes. Remove from the oven and leave to cool.
Leave to settle in the refrigerator for about 3 hours. Rinse and chop the rhubarb and strawberries into pieces. Combine with the muscovado sugar and lime and leave to marinate for at least 30 minutes.
Decorate the pie with the marinated rhubarb.
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