Norwegian Rice Pudding

Topping sauce:

Juice concentrate and water to make 3 cups somewhat strong tasting juice

corn starch (3 tablespoon + 1 teaspoon)

Rice Pudding:

rice porridge leftovers

whole milk

half-pint cartons (or 2 cups altogether) heavy whipping cream

white sugar

vanilla sugar (or 1 teaspoon vanilla extract, but vanilla sugar strongly preferred)