Combine and dissolve milk, condensed milk, sugar and salt.
Warm mixture without boiling and then allow to cool to lukewarm temperature.
Dissolve junket tablet in tablespoon of milk. This may take a few minutes.
Add junket to mixture and allow to set. This may take up to half an hour.
When set, whip in cream and vanilla essence.
Cover and place in freezer. From time to time, take out of freezer and quickly stir well before placing back into freezer (to help prevent ice cream becoming too icy).
Alternatively, place container in a larger container filled with ice and sprinkled with salt. Stir continuously for 30 minutes and then cover and place in the freezer.