I made it... it tasted wonderful. It was fully emulsified, I thought. It didn't look split, it looked creamy like mayonnaise. But then I put it in the refrigerator for a day. When I took it out, I mixed it, it looked fine, but I looked again a few minutes later and it was split! How! Does it simply not last that long? How might you store it so I can actually eat the whole thing over a few days rather than waste it?