Myself, black. I grind it fresh (medium-roasted beans), and make it espresso-style with an Aeropress. I’ve got a Zebra stainless steel mug with a sealing lid.
I apologize if you only find this tangentally-related to Linux, but there is a strong coffee theme found all over the place in the Linux world.
PS: Nice Linux4Everyone mugs are for sale, BTW. @JasonEvangelho , that was a plug for your show.