What is cassis spice?

There is no spice called "cassis spice."

* Cassis is a French word for blackcurrant.

* Blackcurrants are a fruit, not a spice.

You may be thinking of blackcurrant liqueur, which is a sweet alcoholic beverage made from blackcurrants. This liqueur is sometimes used in desserts and cocktails, but it's not a spice itself.

If you're looking for a spice with a similar flavor profile to blackcurrant, you could try black pepper or star anise.