You don’t synthesize a lasagne.
[url=http://www.thefreedictionary.com/concoct]concoct [kənˈkɒkt]
vb (tr)
- to make by combining different ingredients
- to invent; make up; contrive[/url]
You could feasibly concoct both a lasagne and some meth, although I still think Cooking is perfectly acceptable.
When the chemistry side is expanded, it’ll probably be separated anyway.
e:
And yes, I understand that a dictionary definition of synthesis would be accurate for cooking a lasagne, but I mean it doesn’t sound right, whereas (imo) concoct is both accurate and makes immediate sense.