Exceedingly strong cold-drip coffee developed by a radiation safety physicist, made from a number of different beans and roasts. Sampler packs come in lab vials.
https://shop.funraniumlabs.com/products/bbote-sampler-ten-50ml-test-tubes.html
https://shop.funraniumlabs.com/products/bbote-sampler-ii-the-limited-runs.html
They also have a local embassador/supplier in Dublin, but they only carry 1L bottles.