Nectar yes or no? Did you persevere?

I've had a sim make nectar and get all the skill challenges. One thing I discovered in the process is that when your sim checks the recipe, whatever result comes back doesn't really have anything to do with the quality of the nectar. She would get the answer that it wasn't a good combination, but the resulting nectar was still high quality. In general, the less common the produce you use is, the higher quality and price the nectar will be. The best nectar is all flame fruit. And if you keep the nectar in the expensive nectar racks long enough, it will all eventually be perfect quality.