Pour milk into a large microwaveable dish. Add sago and let it soak for 1 hour.
Microwave sago on high for 4 minutes. Stir. Microwave sago on high for 4 more minutes. Stir then microwave sago on medium for 5 minutes. By now mixture should be thick, with glassy beads of sago showing through. If not, microwave again on medium for 1 minute at a time until cooked.
Beat eggs, sugar and vanilla together in a cup then quickly stir it into hot sago mixture.
Microwave sago on medium for 2 minutes then serve hot. Serving suggestion This pudding is delicious with a fruit salad or with a tablespoon of jam.