10th May at 10:21
Agreed. Indeed a little sour. It works with 15ml of lime juice and 10ml rich (2:1) sugar syrup, but it's better if you cut the lime back to 10ml (1/3oz), and I've amended the recipe above accordingly. The recipe above should easily fit in a 2oz shot glass with the correct dilution.
Couple of points to ponder tho: It's very acidic - no wonder the amount of lime juice - maybe it's supposed to be lime cordial?
Also, there was almost liquid for two shots in the shaker after a thorough shake. Maybe it watered down more than expected or the shot glasses are about 3 oz or 100ml?