Hmm... I would assume coffee grounds. Save yourself a headache and cold-steep the coffee grounds in 8 ounces of water.
Primary: Old Bootlegger Imperial Porter, Mill Worker's Breakfast Oatmeal Coffee Porter
Secondary: Oud Bruin, Berlinner Weisse, Apfelwein
Barrel: Whiskey :P
Kegged: Mill Worker's Breakfast Base
Planned: Pure-T Pale with Citra, G-Town Brown 2.1, Muddy Banks Irish Red