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I'll put it the way my dance teacher did. "You're not the first one to go like this (...). But if you put the same movements in the same order as someone else before, that can be considered stealing."

You can't really fault someone for slow cooking beef with carrots, celery, and onion like you do. But there comes a line where, in business, you are profiting off their idea and own them money. Proving those losses in restaurants might be difficult in most circumstances. Something terribly unique like the fictional Flaming Moe might come to mind as a clear case.

In general, it's just not cute. In all reality, you have nothing to offer if you're just stealing recipes.

You have to get written permission from the person whose recipe you are using, and give them credit FOR the recipe.

Otherwise, you could be sued in Court.

only if they let you. you have to ask them to use

Not without permission. You'll be violating copyright law.

Recipes are like anything else written--copyrighted upon the moment of being saved to a fixed medium like a 3x5 index card, a hard drive, website, or magazine page.

So you can only use someone else's recipe with their written permission.

Original material is copyrighted. You need their permission to use their exact recipe and instructions and and photographic material they use.

You can create your own recipe and instructions from that one plus other ones, modified. This is especially important in any commercial (money making) use.