Precise weights are important to ensure each pastry fits the mould snugly. Divide pineapple jam filling into portions of 20 grams each, and roll each portion into a ball.
Divide pastry dough into portions of 25 grams each, and roll each portion into a ball.
Flatten a dough ball. You can do this in your palm or with a small rolling pin, but It is easiest to do this in a tortilla press between two pieces of silicone greaseproof paper.
Place a portion of filling into the centre of the flattened dough.
Gently wrap the dough around the filling, pinching away and setting aside excess dough at the top and where the edges meet. Roll the filled dough between your palms to form a smooth ball.
Place the ball into a metal mould.
Gently press down using your fingers or a small pointed spatula, to ease the dough into the corners of the square mould. The dough will not quite reach the top of the mould – the pastry will expand when baked in the oven. Pave over any thin patches and cracks with the excess dough set aside earlier, smoothing the surface with the spatula. Turn the mould over and repeat on the other side.
Place the shaped pastries, all still inside their moulds, on a baking sheet.