My very favourite thing to do with rhubarb, as I said on another thread, is to combine it with vanilla custard and to allow it to set. I love Rhubarb Fool as well, but the cold custard wins for me. The mixture can be used in a precooked pastry shell as well to be eaten cold.
Otherwise, I like it in any of the usual hot puddings - crumble

, pie, topped with sponge etc. The tart looks nice Rats, a sort of frangipane I think?
When I was a child, if we happened to have some stewed rhubarb in the larder at the same time as a cornflakes (a rare treat), we would have cornflakes with milk and some of the rhubarb spooned on top.