The similarity between a Margarita and Sidecar is very interesting. Both include orange liqueur and a sour ingredient the only difference is:
- Margarita has tequila, lime juice, salt rim
- Sidecar has brandy, lemon juice, sugar rim
All you have to say when the bartender doesn't know a Sidecar is, "It's a Margarita with brandy and lemon juice instead of tequila and lime juice. Oh, and you sugar the rim instead of salt it."
Bingo!!! You should get a good Sidecar.