Cover pudding rice with cold water.
Bring to the boil and simmer until the rice softens.
Drain the rice, keeping some of the starchy rice water in the pan.
Return the rice to the pan.
Add 1lt of full fat milk less 3-4 tablespoons which you put in a small bowl.
Add the raisins, vanilla bean paste and stir.
Simmer for approx 10 minutes.
Mix the reserved milk with the sugar and custard powder/cornstarch and bring to the boil.
The rice pudding will thicken as it cools.
Serve on it's own or with a drizzle of maple syrup or honey.