This thread in the Guides section has 10 different recipe guides. All the stews are listed there.

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To the best of my knowledge, no. There are only two stews that I know of that affect skills:

One stew can be used to make your villagers sick (white-black-black), which gives your doctors a way to skill-up.

Another stew causes your villager to exercise (red-red-red). After a minute or two, when they finish exercising, they have a chance at a building skill-up. If they succeed and you have your circle around that villager, it will say your villager became better at building; if they fail, they will shake their head.

Clickable HyperLinks:
> VV2 Guides <   > Stew Recipes <   > Puzzle Solutions <

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SPOILER ALERT! The information above might spoil the game for those people reading this thread who are inspired to find the solutions for themselves. For this reason it is written in the same color as the background. if you wish to view this text, click and hold the main mouse button, and drag your mouse over the empty appearing space above, starting from the TOP (to avoid inadvertently clicking on the hidden hyperlinks at the bottom). This will highlight the text, making it visible. Thank you!

Borg - thank you! I love you for the idea. And i don't even know you! I had heard that before but wasn't sure.

Glad to help!

Does the villager that ate the "special" stew to improve building skill have to be highlighted in order to improve?

After reading this thread, I now have elders who are master parents! This was sooo easy, I thought it was too good to be true...I was kind of right. Right now every single one of my female villagers who are of child bearing age have babies, all at the same time! And my female master parents have chosen their favorite younger males to dominate! (They are either in the love shack or waiting for someone)
As hilarious as this may be, know that if you choose to make elders through master parenting be prepared to micromanage more than you already do!