Which plants are crossed to produce a Jostaberry?

The three plants that were crossed to make the jostaberry are the blackcurrant, the North American coastal black gooseberry, and the European gooseberry. The hybrid was designed to produce a fruit that avoided thorns and produced a high fruit yield. The one drawback is that the fruit has to be harvested by hand making it labor intensive. The fruit tastes closer to a gooseberry when not fully ripped and more like a blackcurrant once ripe. It can be eaten raw or cooked.

The name Jostaberry was created by combining the German words for blackcurrant and gooseberry, namely Johannisbeere ("Jo") and Stachelbeere ("Sta"). Following German pronunciation of "J", it may be pronounced "yostaberry" in English.

https://en.wikipedia.org/wiki/Jostaberry