1 1/2oz cognac
1/4oz lemon juice
dash Angostura bitters
curl of lemon peel
Another recipe I found is here.
Kevin @ES brought this over for Husband and I to try -- you can definately taste that this is a Sidecar precursor. Very pretty presentation, and had a Lemonhead-y sort of aftertaste: not a bad thing in my book! God, I used to eat those things until my teeth hurt... perhaps that explains my current citrus problems. :/