Chop, peel & core apples.
Add apples to a clean jar. The size will depend on how many apples you want to ferment.
In a small bowl, whisk together the juice of 1 lemon, 1/2 cup water & 1 tsp salt.
Pour the liquid mixture over the apples. Add filtered water so that all the apples are covered. Add the cinnamon stick to the jar.
Add your fermentation weight to the top and press down, so that the floating apples are submerged below the surface.
Fit the jar with a fermentation lid or cover it with cloth & secure it with a rubber band
Fermented for 3-4 days, depending on your room temperature. Keep out of direct sunlight. You should see bubbles forming in the jar, as the natural sugars get consumed by the bacteria and carbon dioxide is formed. The apples should smell slightly alcoholic. The longer you leave them to ferment, the higher the alcohol content will be. They will have a slightly tangy flavor.
Taste your apples after a couple of days.. Once the taste & fermentation level is to where you like it, remove the fermentation weight. Secure with an airlock lid and store in the fridge.