Method
Made two G&Ts. Both in identical glasses, with half a slice of lemon & lime in each, same amount of ice, each with the same volume of gin (50ml, Beefeater). But made one using Fever Tree tonic and the other with Waitrose own-brand tonic (both straight from fridge).
a) Compared both drinks myself.
b) Invited housemates to compare drinks and try and identify which...
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