Yesterday it was hot again, so I didn't want to cook. I got some salad shrimp (wild caught!) and decided to make a shrimp salad. I was hunting in my refrigerator for the ingredients to make a Sauce Louis when I found in the back a small Mason jar with some homemade Sauce Louis in it that I have no memory of saving, so it has to be several months old. I was amazed to find that it was still perfectly good, since it has cream in it, but it didn't smell or taste soured. I did make it with some whey in it, so I guess that preserved it, even though I didn't let it sit out at all -- it's just that when I made it the only lemon juice I had on hand was already mixed with whey, which I use to flavor sparkling water. So I used that as a flavoring in the sauce, and that's the only thing in there that would preserve it. But I ate it, and I'm still here and healthy this morning, so it must have been okay!