This recipe got high marks from some Church Ladies recently:
3 pounds rhubarb, cut up
1 bottle vodka
1/4 cup grand marnier
Simple syrup (6 tablespoons sugar heated to boiling with 1/4 cup water)
Cool the syrup before mixing into the rest of the ingredients.
Let stand 1-2 weeks in covered container.
Recipe is flexible - it originally called for 1/2 cup of the Grand Marnier, but my source preferred with less.
It's a lovely pink color and, according to reports, is dangerously good when mixed with 7-Up.
On a somewhat related note, I'm re-reading Anne of Green Gables now and this is just homey enough to make me think of Marilla's Raspberry Cordial. (Medicinal purposes only, right?)