Ingredients:

Bring to boil and simmer for about 15 mins: (for 5 L water)

200g ginger – chopped or sliced (I use a food processor with a bit of water). You can use more if you want.
Skin of 2-4 lemons or limes – avoid the white pith (I use potato peeler)
Juice of 4 lemons or limes
Optional:

Chillies fresh or dry
Cloves
Cinnamon sticks
You can fairly much add anything (provided it doesn’t have a preservative in it) you think you will like the flavour of in your ginger beer eg fruit, spices etc
As much water as you can fit in your pot with enough room not to boil over– a bigger pot is best but if you only have a small one, use that.

Take it off the stove and add your sugar.

Stir to dissolve. Use 400g sugar / 5 litres for approx. 5% brew – 600g for approx. 7.5% brew. You can use plain white sugar or mix brown and white for a darker coloured brew with a slightly richer flavour. Or you can use honey or any other fermentable sugar.