I have been using this insert for years and it is still my favorite. I plant groceries for a week at a time, so I feel like I need some room to spread everything out and see it all in one place.
It's a letter-size page, so I don't keep it in my planner. I know I could shrink it down, rotate it and make it a foldable, but that would defeat the purpose I need it for. Who knows though, I'll probably try it, LOL! Once upon a time, I thought I would never use a planner smaller than half-size!
The top portion is where you write down your meals, underneath is where you list the ingredients for each meal/recipe. This helps me not to forget an ingredient. You can download it here.