How to obtain pure alcohol from mixture of alcohol & carbonyl? (Grignard experiment) If one discovers that after finishing up a Grignard reaction that their alcohol product has been contaminated with the carbonyl starting material, how could they separate the alcohol from the carbonyl compound to obtain a purified alcohol product?

I was thinking that they could recrystallize the contaminated product using an alcohol as a solvent, but is there a better option for separating these two compounds?
I rather doubt that there is a better option in general. Other possible methods are 


distillation
To give an example, acetone has a boiling point of 56 °C, while tert-butanol boils at 82 °C.
column chromatography on silica


But in many cases, your suggestion to separate the compounds by crystallization is a good idea. This is in particular true when your product has a high boiling point and/or you have to purify large amounts of substance.