I have a quince tree I planted. They used to be very common in New England because they contain a lot of pectin. So, prior to the availability of commercial pectin, people mixed them with other fruits to make jams and jellies.
They're hard to do a lot with though outside of whatever you can separate using a food mill. You can make quince "applesauce", butter, jelly, and paste pretty straightforwardly. But because they're so hard and tend to have a lot of scattered seeds (probably depends on the variety), it's a lot of work to cut clean fruit that you can use for poached slices or preserves.
You just eat around any seeds.
I don't care for the texture of quinces (too gritty), so what I do is add halved pears to the quinces about 2 hours from the end. This way you get quince flavoured pears - fantastic warm with vanilla ice cream.
(The thing I really miss, though, is wild raspberry or bramble jam. Mmm...)
I used to have a raspberry patch - nothing nicer than wandering out on a warm morning and gorging fresh raspberries - certainly more fun than getting caught up in a bramble.
I love those, too bad they are rarely available in Germany. It's one of the fruits I always show other people if I can.
I thought that was supposed to be pretty difficult to grow.
https://en.wikipedia.org/wiki/Wasabi#Cultivation
I recall reading about some company trying to do so in Oregon and failing at it, despite the climate being pretty good.
It looks like there's actually a farm in Half Moon Bay producing it: http://www.foodgal.com/2014/04/californias-only-grower-of-re...
"Mountain streambeds are the plant's natural habitat. Though some Japanese wasabi is cultivated in soil, the highest quality product is water-grown, with plants sprouting from gravel-laced terraces through which streams are diverted."
Still sounds tricky compared to a lot of stuff.
I've also found a place which imports it from Japan and the USA - https://shkspr.mobi/blog/2012/12/more-fresh-wasabi-in-the-uk... - which may be closer to where you are in the world.
https://books.google.co.uk/books/about/James_Wong_s_Homegrow...
Instead he lists mini kiwis, cucumelons, New Zealand Yams etc etc