yes and yes.
I chop up a whole lasagne into bite sized pcs, and then further crumble it as it dries. It tastes just fine re-hydrated, but it'll never look like it was fresh out of the pan again, unless you were to dehydrate it by ingredient and then reassemble to eat.
Fresh Pasta can also just be hung to dry as well, or twirled into portion sized 'nests' (flour well). Sauces: simmer down till good and thick, and then dehydrate, flipping and crumbling often.
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