Preheat oven to 180°C/325°F. Rub the vegan butter around the base and sides of a medium-sized ovenproof casserole dish.
Rinse the rice in a sieve under cold running water and drain well.
Add the rice and all other rice pudding ingredients to the casserole dish and mix well. Put into the oven and bake for 1 ½ hours.
Serve on it's own or topped with the berry sauce.
For the winter-spiced berry sauce:
Meanwhile, add all ingredients to a saucepan over a medium/low heat and stir well. Allow to bubble and cook for 15 minutes until thick, stirring often. Taste and add more sugar if desired.