In this sentence 昨日レストランに行きましたがすごく美味しかったですよ, what is the function of が? So far I have learned that this particle is used to emphasize what comes before it or is used as "but". However, I cannot understand the particular usage in this sentence.
When 「が」 is used as a conjunction mid-sentence, it means "and" as often as it means "but".
Even Jisho gives you that usage.
"I went to a restaurant yesterday and it was very yummy."