Specifically making my own tomato paste, as mentioned in the OP, actually, if you'll forgive my not having done it in recent years because I've had a construction zone instead of a garden, that is. It's dead easy, actually. Dehydrate "paste" style tomatoes like Romas (I do this anyway), store them in jars, and whizz in the blender to grind them to powder as needed. Add a little water... Tomato paste!
We made our own house (by "we" I mostly mean my husband, though I swung a hammer, too).