帮忙翻译一下: "好久没吃过你做的菜了"

It has been a long time since I ate the dish you cooked.
It +be+some time since+从句（如果从句中谓语动词是非延续性动词，翻译为做某事已有多长时间了，如果从句中谓语动词是延续性动词翻译为不做某事已有多久了）
eat显然是延续性动词，那你就自己选择吧！

Not eaten for a long time you do dishes

i haven't eaten the food that made by you for a long time.

I haven't tried the food made by you for a long time.

I have not tried/tasted your dishes for quite a long time.

"For a long time you do not eat dishes"