Preheat the oven to 200 deegree C.
Sift the flour with the baking powder in a large bowl and stir in the butter.
Make a well in the centre of the mixture.
Add half cup water and mix till the mixture starts coming together.
Make a ball out of the sticky dough.
Place it on a lightly floured sheet of baking paper.
Roll the dough out into a rough rectangle (26x20 cm) between two sheets of baking paper.
Now spread the jam on the dough leaving a 2 cm gap on the shorter sides.
Roll up the dough starting from the shorter side.
Place the roll, along with the baking paper on a baking tray and roll the baking paper up to cover the dough, twisting the sides.
Bake for 30 minutes or until golden brown.
Allow the roly poly to cool down completely before slicing it.
Serve with custard.