In a heavy bottomed pan add milk (1 litre), cream and sugar.
Whisk until sugar has dissolved. Add raisins.
Dissolve the cornstarch in one cup cold milk and mix until the cornstarch has dissolved.
Add the cornstarch-milk mixture into the milk and cream and whisk continuously on medium heat
When the milk thickens to almost half add the mastic powder and continue whisking until the powder dissolves and the mixture has thickened considerably.
Tun heat off,add rose water and orange blossom water. stir through.
Pour in individual bowls or a pudding bowl. Garnish with pistachio powder.
Refrigerate overnight. Serve chilled.
