The Chelsea Sidecar is essentially a variation of the classic Sidecar cocktail. The main difference lies in the proportions of the ingredients and sometimes the choice of citrus. While both drinks feature a base of triple sec, lemon juice, and a spirit, the Chelsea Sidecar often uses dry gin as its spirit instead of the traditional cognac found in a classic Sidecar. These adjustments lead to a gin-forward flavor profile with a distinct crispness compared to the richer, brandy-based original.