Watermelon rind pickles are an old fashioned thing to make. Because they are made from the part that is normally thrown out, they seem almost “free”. I’ll give my exact weights then give the recipe per kilo of rind. After the green peel and pink watermelon is removed from a 12 # watermelon there remains about 4 # (1874 g) of rind. Cut this into one inch cubes and soak it in an equal weight of 7.5 % salt brine for three hours.
This seasons the rind but also firms it by reducing some of the moisture. After draining, rinsing and drying overnight in the fridge the weight of rind had dropped 1605 g. The rind was then boiled with an equal weight of clean water (2 qts.) for three minutes to adjust the salt and after draining the rind weight had dropped to 1503 g and the rind was barely translucent.
The jars are prepared and a pickling liquid is made from white vinegar 688 g (3 cups), water 256 g (1 cup), sugar 600 g (3 cups). The recipe I had suggested flavoring the pickling liquid with 3 cinnamon sticks and 1 t cloves but I used instead sliced fresh ginger root 16 g (about a thumbs worth) and cardamom seed 7.3 g (2 t). I tied these up in a tea bag (cheese cloth would work as well).
The spices are brought to the boil then allowed to steep for 15 minutes covered. The rind is then added and the mixture is boiled for 3 minutes. The pickles are then put in jars, sealed and processed in boiling water for ten minutes (longer at higher elevations). Four pints.
The recipe per kilo of rind looks like this:
Watermelon rind 1000 g
7.5 % salt brine 1000 g
Pickle
Sugar 320 g
White vinegar 367 g
Water 137 g
Fresh ginger 8.5 g
Cardamom seed 3.9 g
The original recipe was from this book:
https://www.amazon.com/Foolproof-Preser ... B538NTXXRW