You definitely want to let the Oreo Sushi rest and firm up in the fridge before cutting it. We recommend letting it sit there for two hours. Be careful where you lay it, though. Laying the Oreo Sushi log directly on a shelf in the fridge means that one side will be against a flat surface and that will cause the log to flatten. So, instead, you want to sort of float the Oreo Sushi log. I've found that the crisper bin usually have enough things in it that the Oreo Sushi log will be suspended enough in midair that it doesn't flatten on one end. If your log does flatten, just roll it on the countertop a few times to reshape it before cutting it.