1 1/2 oz dry gin (Boodles is always nice)
1 1/2 oz cranberry sauce syrup*
1/4 oz lemon juice
Shake and strain (over ice only when there's none outside) then top with 2-3 oz rose champagne or cava.
In the interests of proper logging, I should note that I initially made this with pisco, which was nice, but didn't have quite the snap I was looking for. Something about that gin-champagne cocktail is just so delightfully speakeasy.
*This was essentially leftover homemade cranberry sauce (made with real cranberries!) that I pureed until smooth, stretched out until pourable again, then ran through a fine strainer. You may wish to sweeten or tweak this further to your liking. Mine was still fairly tart, courtesy of fresh cranberries, hence the hefty amount. You may also wish to double-strain any cocktails you make with the stuff depending on its final texture.