The freezer is a great place to keep leftovers, at least for me. I'm just not organized, nor am I motivated enough to do elaborate meal plans that incorporate leftovers during the week. Glen is great at cooking with leftovers, and he's happy eating them. Me? Not a fan. That doesn't mean, however, that I want to be throwing out perfectly good food left and right.
Pretty much everything freezes well once it's cooked. Just take a stroll down the freezer aisle in your local grocery store. If they can freeze it, so can you!
So here's an example. Gravy and mashed potatoes. We had roast chicken the other night, and I had at least a cup of gravy leftover and a couple of servings of mashed potatoes. Everything else went into making two hot lunches for Glen to take to work or it went into the pot to make chicken broth. Many families I know would have simply made something like shepherd's pie later in the week, but my family doesn't like shepherd's pie. So I froze these items in Ziploc bags, and they'll be good for about a month in the freezer. Why freeze them this way?
There have been times when I've wanted to make mashed potatoes and I have maybe 2 potatoes sitting in my pantry. Potatoes are expensive when you buy organic. Having leftovers in the freezer means I can thaw, heat and add them to fresh mashed potatoes very easily. There have also been meals that I've prepared only leftover mashed potatoes as a side dish. Hint - they get a little watery after they're frozen, so keep that in mind when incorporating them.
Having bags of gravy in the freezer means I can serve gravy anytime I want, with whatever I want, whether I have pan drippings or not. Just thaw and reheat. Why spend the money on the jarred or packaged nonsense? Hint - label your gravy bags with any dominant characteristics, such as chicken or beef and any strong flavors they may have, it might affect your choice with which gravy bag you grab to serve on a given night. The one above was heavily laden with Smithwick's and labeled as such - which is what I happened to baste the chicken in that night. :)