It is "mottainai" to throw away used up leaves after infusions, full of beneficial nutrients! Here are some methods to recycle leaves after infusions (re-posted from Maiko Tea Shop).
Used up tea leaves, a dash of salt, sakura ebi (dried up shrimp), jako (tiny dried fish), tarako (fish eggs), sesame seeds
1. Microwave the used up tea leaves to evaporate the water
2. Crush the dried up leaves (e.g. in a food processor)
3. Dry-roast the crushed leaves in a frying pan to bring out a pleasant aroma. Add salt and other ingredients depending on your taste.
Enjoy by sprinkling over rice.