Rhubarb! How do you prepare/cook it?

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Help new house new garden, discovered rhubarb now ds wants rhubarb for desert tonight... what do I do can anyone provide a fools guide eg step 1 do I pick it/cut it from the garden step 2 do you just throw away the big leaves at the top step 3 do you need to trim it or just wash it and how do you cook it... worried about poisioning family! Can anyone help please???

Hmm.

Now I hope the rhubarb dd and I tried earlier is the one you can eat raw.