Learn Swedish: Eftersom du skär löken, steker jag köttet. - Since you cut the onion, I fry the meat.

This is the Swedish V2 (verb-second) rule in action! The entire first part of the sentence (Eftersom du skär löken) counts as position number one. Therefore, the verb of the main clause (steker) must take position number two. The subject (jag) gets pushed to position number three, swapping places with the verb.

Since Swedish relies on the V2 rule, why isn't the first part Eftersom skär du...?

The V2 rule applies to main clauses. Eftersom (since/because) starts a subordinate clause (a dependent, supporting part of the sentence). In subordinate clauses, the standard word order is almost always Subject + Verb. Because of this, du skär stays in its normal order.

Could this sentence also mean "Since you are cutting the onion, I am frying the meat"?

Yes, absolutely! Swedish does not have a separate "-ing" tense (present continuous). Depending on the context, du skär translates to either "you cut" or "you are cutting". In an active kitchen scenario like this, the "-ing" translation often feels more natural in English.

Can I use för att (because) instead of eftersom at the very beginning of the sentence?