Preheat oven to 180° C, gas mark 4.
Put the flour in a large bowl.
Cut the butter into cubes and work quickly rubbing it into the flour until it resembles bread crumbs.
Add the cold water and pull it together to form a ball but handle as little as possible.
Roll out on a cold hard surface into a circle just larger than an ANTA pasta dish.
Put the rhubarb into the pasta dish and place a whole piece of ginger in the centre.
Spoon the syrup over the rhubarb.
Loosen the pastry circle and lift it onto the pasta dish to form a lid.
Trim the excess from the edges and roll it again and cut it into strips.
Place round the edge and with the back of a fork, press it down onto the rimm of the dish leaving a space between each impression.
Bake in the oven for 15 minutes until the pastry is golden brown.
Sprinkle the top with caster sugar.
Serve warm with ice cream as a pudding or serve cold upside down as a Tarte Tatin by placing an ANTA serving plate over the dish and quickly flipping it over.
The lucky one finds the whole piece of ginger in their serving!