Here's a very simple remix on the Sidecar that used up a lonely remaining Seville orange. I kinda wish I'd been able to get this out earlier for Mixology Monday, since it seems to fit this month's criteria pretty well. It's not particularly fancy, but it turned out well for all its simplicity.
2 oz cognac (grade not too critical here, but I used a cheap-ish VSOP)
1/2 oz Mathilde Poire
1/2 oz Seville orange juice
1 dash Angostura bitters
Shake and strain into a cocktail glass. Garnish with a thin orange slice, if you have any left.