We have a very productive rhubarb patch. Right beside the zucchini patch.
Chop it into pieces, put it in a pan with some sugar and possible a little bit of water. Heat it up and the sugar should help draw out some liquid and cook it until the pieces become soft or disintegrate. Takes about 5-10 minutes.
The crumbled rusk is meant to give the cooked rhubarb a thicker structure and the sugar is meant to counter the sourness.
Quite delicious imho.
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[0]: https://en.m.wikipedia.org/wiki/Rusk#Netherlands_and_Belgium...
[0] https://de.wikipedia.org/wiki/Rhabarberkuchen#/media/Datei:R...
In general you can often use it as an alternative for lemon zest or juice. I'd say though that it is one of those veggies you buy when it grows locally. I love rhubarb, but if you have to import it, there is probably a better local alternative.
https://cooking.nytimes.com/recipes/1023153-khoresh-rivas-sa...