
Ruby port is the youngest, most common style of Port — a sweet red fortified wine from Portugal’s Douro Valley.
Reserve ruby or LBV port
Use one for one. The drink barely changes, though the fruit is deeper.
Sweet red vermouth
The nearest swap with no port at all. The drink turns a little weaker, sweeter, and more herbal.
One for one, the drink keeps its sweetness and strength but turns brown and loses its berry note.
Port is fortified mid-ferment with grape spirit, which stops the yeast and leaves the unfermented sugar in place. That is why ruby is sweet and strong at once. It then rests in tank or large vats, where the volume-to-surface ratio keeps oxygen away from it.
Keeps for weeks in the fridge once opened. Ruby loses its freshness faster than aged styles.