The berry (actually not a true berry but a cone) from the juniper plant used to make gin. The plant is native to Europe and America. The little bitter berries are avilable dried and are used to flavor sauces and some meat dishes.
You can purchase juniper berries in well-stocked grocery stores and specialty shops like Williams Sonoma. They are also available online at Amazon.com. Juniper Berries Whole
This image shows unripe juniper berries on the Juniperus communis shrub.
image by: micromoth