It just seems like the only things we should be importing from across the globe are things that absolutely cannot be produced domestically. For example, I've heard that coffee beans only grow in certain climates, so that would be a commodity that makes sense to import.
Pretty much everything else, including this supposed Tunisian olive oil, just sound like luxury goods to me, and should be priced accordingly.
GHG emissions from boat transport are actually a very low % of the total GHG emissions from producing that food. Moving it across the country on a truck would certainly produce more emissions than shipping it by boat from abroad.
https://ourworldindata.org/food-choice-vs-eating-local