Soak the bran (or wheat) overnight, put the bran (or wheat), mixed with the proteid food, into a saucepan with the one and a half pints of water, and let it simmer for about one hour. All the water will be nearly absorbed by this time.
Now add the milk (and sugar, if desired), and bring gently to the boil, whisking all the time with a wire whisk. Strain through a fine sieve into a glass dish or glass jug, and add the lemon-juice. This can be eaten hot or cold.