He said when he makes eggs, he washes the shells and keeps them in a plastic bag. He starts the recipe by putting the dry egg shells in the toaster oven for 20 minutes at 180 degrees Celsius.
The purpose of this step is to sterilise the shell. In the comments, users said to make sure you only heat them in an oven, not a microwave, as the latter can eliminate any nutrients in the shells.
Once out of the oven, Vincent uses the bottom of a jar to crush the shells into smaller pieces. He then adds a few handfuls of those pieces to a mortar and pestle, and crushes them even further until they are a fine dust.
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He adds two tablespoons of the powder to a glass jar, along with two tablespoons of vinegar. This step is necessary, as it will cause a chemical reaction to liberate the calcium from the egg shells.
He lets that sit for about 3 minutes, then adds the solution to two litres of water. Then the fertiliser is ready to use.
The best plants to use the fertiliser are those that are Calcium hungry, like fruits and vegetables. That includes tomatoes, peppers, aubergine, and leafy greens like chard or spinach.
In the comments, someone asked how often they should use the solution. He replied, saying he uses it at planting, and then again when he starts to see flowers or fruit growing.
