Linseed Tea
Put a table-spoonful of linseed into a clean earthen pot or pipkin with a quart of water, and a little orange or lemon rind; boil this gently for about ten minutes, and then strain it through muslin into a jug; sweeten with honey or sugar, add the juice of a lemon, stir all together, and give this beverage to allay irritation of the chest and lungs—in the latter case, the lemon juice had better be omitted. Linseed tea in its purest form is an excellent accessory in aiding to relieve such as are afflicted with gout, gravel, etc.
Source: A Plain Cookery Book for the Working Classes, C.E. Francatelli
The Lemon Decoction in Malaria
This remedy has, besides its anti-malarial efficacy, distinct value as a tonic to the stomach. Take a fresh lemon; cut it into thin slices, rind and all; boil it in three tumblerfuls of water in an earthen pot which has not been previously used for culinary purposes; prolong the boiling till the liquid contents of the pot have been reduced to one-third — that is, to the volume of one tumbler. Pass the decoction through muslin, squeezing out the residue of the lemon, and let it cool for several hours. Let the whole be taken in the early morning, fasting.
Source: Audel’s Household Helps, Hints and Receipts