Summarize:

When you want to make instant pudding, stir ½ cup (96 grams) of the mixture into 2 cups (475 milliliters) of milk. Cook in a saucepan over high heat, stirring constantly. When it starts to boil, reduce the heat to a simmer. Keep stirring, and cook for 3 to 5 minutes, or until it thickens. Pour into a serving bowl, and let it set for 5 minutes. You can serve this hot or chilled. If the vanilla beans get into the pudding, pick them out with a fork after you cook the pudding, and discard them.
Store the instant pudding mixture in a cool, dry place.