Dissolve the gelatin in the cold water in a 2-quart saucepan, and then put on the stove over low heat.
Stir constantly until disolved (which will take less than a minute), then add the sugar and stir until dissolved
Remove from heat and add the vanilla, orange juice, and buttermilk; stir to blend well
Place the saucepan in the refrigerator to cool and gel
Check in about 30 minutes. When the mixture starts to firm, whip the cream
Pour the buttermilk mixture into the whipped cream, and blend with a wire whisk until smooth
Pour into a bowl and refrigerate until firm, about an hour
Serve with Danish Strawberry Pudding (Jordbær Grød -- the recipe can be found here). It's also wonderful with fresh berries