Avoided going out to eat again.
In reviewing our end-of-the-year finances, I'm amazed at how this change has taken hold. We weren't crazy by any means with eating out as a family, perhaps spending $150 a month, but did so with reasonable frequency. I started cutting way back on this early in mid-2018 in a move toward frugality. I will admit that at first, it was a difficult adjustment; there were plenty of times I just wanted to get whatever tasty, easy (though to be fair, still reasonably cheap) meal I felt like grabbing from a local place. However, as the months went on, that desire started to evaporate, and I became perfectly satisfied scrounging up food from the house, rather than having scrounging feel like a capitulation. Hedonic adaptation indeed.
Down the road, I would like to get more into cooking frugal meals for more variety (and probably as a healthier option); DW used to cook a fair amount but a change in work responsibilities and schedule has made that difficult for her. I'm not naturally inclined toward cooking, but I do usually enjoy it.