Time-Frozen Milk

Regular milk has one fatal flaw: it goes off. It's like milk has a personal vendetta against time itself. Well, we fixed that. Sort of. We made it so the milk exists in multiple timelines simultaneously. This milk expired yesterday. It's also fresh tomorrow. Today? Today it's just confused. And honestly, so are we. But it tastes fine! Or it will. Or it did. The point is, you can drink this milk and it'll be fresh. Probably. In at least one timeline. We source our milk from cows that exist in a temporal loop. They're always being milked, but also never been milked. The milk itself is caught in a time dilation field that keeps it in a state of perpetual "almost expired but also brand new." WARNING: Do not use this milk to make cheese. The cheese will be both aged and fresh, and that's just too much for one sandwich to handle.