[twic]

My standard test cocktails are a Vieux Carré, and a Sidecar, but i ask for it to be less sour than usual. The former is moderately complicated, and tastes wrong if it's not bang on. The latter is simple, but tests their ability to deviate from a script.

(also, standard-ratio Sidecars are an abomination)

[Steve44]

I normally do a 3:2:1[1] for a sidecar and get good feedback on it.

[1] my recipe is 2 x VSOP Brandy + 1 x Cointreau + 0.5 x Lemon juice / Shake & strain.