Remove the peel and seeds of the lemons and put them into a tea bag. Break up the lemon flesh
Coat the lemon flesh in sugar and let sit overnight. The moisture will come out of the lemons and dissolve the sugar, but it's okay even if the sugar doesn't dissolve.
Add Step 2's lemon flesh and sugar to the bag with the peels and seeds from Step 1 into a pot and turn on the heat.
Once it comes to a boil, remove the peel and seeds bag, remove the scum from the surface, and heat over low. When the thickness is just a little runny, turn off the heat.
Transfer into a sterilized container, close the lid tightly, and turn upside down. Let rest until cooled.
Adjust the amount of sugar to taste between 50 and 100% of the weight of the lemons. Adjust to taste. To highlight the tartness of the lemons, aim for 70%.