Bread, olives (and olive oil), cheese, meat, fish, fruit, nuts, wine.
That being said I think the ubiquitousness of tomato sauce even in modern Italian cuisine is overestimated.
https://www.theeternaltable.com/historical-recipes/tortellin...
This is also a major base of French cuisine and called Mirepoix.
On the other hand it's almost impossible to imagine what food was like in the Americas before Columbus. No wheat, no pork/beef/chicken, no dairy, no onions, no cabbage, no oranges/apples/figs, any citrus and much much more.
Potatoes and corn, losing though would be absolutely tragic. Also avocados.
Compare that to pork for instance. Remove that and you've removed like 50% of Austrian cuisine.
They couldn't find one mammal from which to obtain milk? It's a pretty obvious thing to try, for obvious reasons.