What are some useful things to do with the various kinds of coffee waste?
1. Unbrewed ground coffee. From grinder adjustments, sweeping out the doser, etc. Do you brew it in some other way? Collect as a coffee medley in freezer? Use for cooking?
2. Brewed coffee grounds. What plants like this? Is there any use other than fertilizer?
3. Unground stale beans. I guess you really shouldn't have much if any of this.