Besides raw ingredients like meat or fish I freeze lots of other things; I grew up in a multi generational family and have memories of my grandmother cooking and freezing things as well as canning which people don't do as much anymore.
Recently we had a big cookout for a pre-wedding dinner and had lots of chicken left over. I made Chicken Enchiladas Verde and froze a few cassarole dishes for later use. I routinely make savory pies out of left overs and freeze them. In the summer I make apple pies and put them up as well.
Lots of stocks for soups and cooking although finding veal bones in Texas is near impossible so it's mostly chicken, beef and vegetable stock.
Duck fat. Comes in handy for frying potatoes!
I might add that being here in the Texas gulf coast area is a challenge for freezing things as we have these things called huricanes that cause us to loose power for long periods. I lost a whole freezer full after the last one.
