Curious what folks like to do with spent coffee grounds / espresso pucks / stale beans. Personally have tried to use as fertilizer with limited success, used as a substrate for growing oyster mushrooms, and in cooking (brown bread made with some stale espresso grind really helps the flavor).
At the office, I give them to one of my staff since their family has a large garden/small farm which makes and uses compost.
At home on the weekend, I generally just dump the moka pot puck into the waste bin but sometimes will save it to dry and sprinkle onto the balcony rosemary plants.