Don't shoot me but I substituted GM with Triple-Sec as it was all I had and thick end of a lemon for a wedge (squeezed so a little extra juice and oils). I also got lazy so stirred over two ice cubes - very nice indeed but the melting cubes dilute things quickly - you live and learn...
I also repeated this with bourbon instead of brandy/cognac - a variation on Kentucky Iced Tea without extra sweetness, lazy reuse of the lemon "wedge" too - and it's also nice, the reduced sweetness allowing a little extra citrus to cut through the mix but just as tasty I think. (Too much so, hard to sip and savour either option trying to beat the meltwater!....)
I can't say this is a great drink, but it is perfectly fine. Suited to a hot summer day I would say. A bit gingery. A bit Cognacery. Evenly balanced sweet vs. sour. It tastes on the gentle side of neutral (but it contains more alcohol than that).