Homemade Ginger Beer

0 In a pot bring grated ginger and 2 cups of water (0.5 l) to a boil. Add brown sugar (or molasses for the darker color), a pinch of salt and cook until the sugar is dissolved, for about 3-4 minutes, stirring occasionally. 
1 Strain the liquid through a sieve covered with a few layers of cheesecloth and squeeze well into a large mixing bowl.
2 Add the rest of the water (about 6 cups), lemon juice and brewer's yeast. Stir to dissolve and pour into four 16 oz (0.5 l) flip top bottles (or equivalent) using a funnel, then cap them.
3 Let it ferment under room temperature for 48 hours, then transfer to the fridge to stop the fermentation process. Add extra sweetener of your choice before serving (see notes). Enjoy!