Learn Spanish (Latin America): No me gustan ni los mariscos ni el cerdo.

In Spanish, if the negative words (ni... ni) come after the verb, you must put a no before the verb. It translates literally as 'I do not like neither seafood nor pork'. This double negative is completely correct and required in Spanish.

Why is it gustan (plural) instead of gusta (singular) since el cerdo is singular?

The verb gustar must match the things being liked. When you join multiple things with ni... ni, they add up to a plural subject, just like when you use y (and). Because you are talking about both los mariscos and el cerdo, you need the plural form gustan.

Why do we need the articles los and el here when the English translation just says 'seafood' and 'pork'?

In Spanish, when you talk about things in a general sense, especially as the subject of verbs like gustar (to like), you must include the definite article. English drops the article for broad categories, but Spanish requires it.

Could I put the food at the beginning of the sentence instead of using no me gustan?

Yes! You can put the negative subjects before the verb, and if you do, you must drop the no. The sentence would be: Ni los mariscos ni el cerdo me gustan. However, starting with no and putting the verb first is much more common in everyday spoken Spanish.