Ottavia's Baked Tagliatelle with Ham, Peas, and Mushrooms

This, to me, is a proper Sunday dish: you can happily immerse yourself, for a few hours, in the making of it, building each component and then bringing them all together.

One important ingredient note: you really do want egg noodles rather than typical dried pasta made with semolina flour and water, which is too sturdy for this preparation. If you are fe…