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If your zester is crap just use your cheese grater but make sure to cook it a little to make more tender to chew on......
Also make sure you buy waxed free lemons as the stuff they use to wax is not a nice chemical ....
No wax on my lemons they come off my lemon tree in the garden Actually I did use a cheese grater but it was a bit big hence the need to chop it with a knife.