The kid asked what was inside the K-Cup (the coffee unit for the single serve coffee brew system). We shook and cut and concluded there are two basic kinds.
- Classic – “teabag of coffee”
- Fully dissolvable contents – like hot chocolate and “Chai Latte”
The classic kind is described by Wikipedia, and you can discern the design by simply shaking and examining an unused K-Cup. To complete the investigation, I cut a used classic K-Cup open. The embedded filter holding the coffee (like a teabag) is quite apparent.
During brewing, the hot water is injected at the top (through the foil seal – here on the bottom because the K-Cup is upside-down) . The brewed coffee drains out the bottom, here visible on the left half of the opened shell.