Anywho, I have done this exact recipe now 4 times. Killer... and my mates who actually like GB's reckon its the shiz. You can also try chappos GB from scratch as mentioned above for something a little more challenging.
1 x Coopers Ginger Beer Kit
1.5kg of Dextrose (or a box of brewing sugar and about 500g extra dex)
500g LDME
1 x 750ml Bottle of Buderim Ginger Refresher (basically ginger/sugar concentrate)
350g of coarsely grated fresh ginger
5 small chillis (birds eye type) finely chopped inc seeds (i like it with a bit of spice)
Kit yeast and brewed for 2 weeks (primary only) @ 18 deg c. I also crash chill for a couple of days so I am not drinking all of the yeasties too. Add the chillis and ginger into 5 litres of boiling water and boil for 30 mins. Pour all fermentables into pot, boil a little longer then up end into a cleaned and sanitised fermenter, top up to 23 lt. Piece of piss
I ditched the idea of lemons and zest and now use this method everytime as it is easy and very repeatable.
Just for ***** and giggles, the last batch I did was a double and 1 fermenter used coopers packet yeast and the other used champagne yeast (ec-118 i think). Very little difference in taste IMO
I may try a from scratch GB one day, but I'd rather invest my time in AG beer instead
Hope this helps all
Tyler