It's been a while since you ate fish. I bet it's tasty.
1) You haven't had fish for a while. Is it good?
「しばらく魚食べてないよね。美味しい？」
haven't had 〇〇 for a while で「久しぶりの〇〇」のニュアンスが出せると思います。
2) It's been a while since you ate fish. I bet it's tasty.
「魚食べてからしばらく経つよね。美味しいでしょ。」
It's been a while since you ate 〇〇 でも「久しぶりの〇〇」のニュアンスが出せます。
ご参考になれば幸いです！
日本 
