Store leftovers in an airtight container at room temperature for up to 3 days, or refrigerate for up to a week. Bring to room temperature before serving for best texture.
If you cannot find black currant flavored tea, you can substitute with regular black tea and add a bit more crème de cassis or black currant jam to the ganache for flavor.
For a vegan version, substitute the butter with coconut oil, use flax eggs, and use a dairy-free chocolate and heavy cream alternative.