From what I recall from my father
4 very large ginger peeled and coarsely grated
1 stick cinnamon
1 cup sugar
One of those glass apple juice jugs or some large glass vessel with lid
Mix all together and place in jar in a dark warm area of the house.
Let it sit for a couple of days.
Shorter time if it is a very sunny or warm area. Definitely no more than 4 days.
Then you can add more sugar to taste and dilute if needed. My dad also added freshly grated nutmeg.
Some people like to add lime to the brewing proces.