Being after Thanksgiving and before Christmas, I find this is a great time to take inventory of what's in your fridge, freezer, and cupboards. This will help to not over buy on your next grocery trip, but will also help to know what you need. I actually did this a week or so ago, but I'm thinking with family in and out of town, I should really do it again.
Taking inventory of your food items basically consists of going through each area and writing down either specific items (if you have time) or meals that you could make with the items you already have (or meals you could almost make, just making note of what you need). This is a great thing to do when first starting to meal plan and then periodically there after.
Here are some (not great) pictures of checking out the stock and then meals that I have written out that I keep posted on the fridge. The second picture is terrible, I know. But I figure, it serves the point :).