Have you ever been to Italy? Pork and chicken are abundant and in the old days, practically every family had at least one pig plus chickens around. Practically every kitchen back then had sausages, salame, capicolla etc... hanging from the ceiling hooks to cure. In the southern parts, seafood is huge.
The story where meat was so expensive actually has to do with beef. There are only a few regions in Italy where beef is part of the culinary tradition. Italy being a mountainous country simply lacks the flat space for a large and intensive beef industry. When immigrants came to the united states, they found abundant beef in the markets and thats where the expensive meat story began.
Re: eggplant it is very prolific producer, especially in a hot climate. I grew 12 eggplant plants and was swimming in them by the end of the season. They are a cheap source of protein and will keep producing right until the first frost. They take well to baking, frying, roasting, sauteing and even pickling.
Eggplant, Squash, Cucumber, and Zuchini grow like mad one they get going. We only have a single plant of each. By the end of Summer I have to give it away.