I’ll keep this one short, but strong.
The perfect cosmopolitan should be a cloudy flamingo-pink color, not clear and hot pink or, worse yet, red. It should also not come from a cocktail-mix bottle. All a cosmo is, alcohol aside, is cranberry juice and some lemon or lime juice. I think cosmo mixes are the biggest racket in the grocery store.
Anyway, full disclosure: the International Bartenders’ Association would disagree with me here, buy only slightly–my proportions are slightly off. Reason being that, while a cosmo should be smooth I like to lessen the tartness by spiking it with extra sharpness by way of extra lime juice, acerbic and sour.
The history of these are disputed so rather than speculating lets just get our drink on, k?