I don't know how the author go about asking for the recipe's creator permission but many cookbooks I read say something like these examples below:
- [Recipe Name] by [creator name] and/or [cookbook name]
- This is my favourite [whatever] recipe. I got it from a chef at [place name]
- I really like this recipe. I got it while visiting [place name]
- I have been using [creator name] recipe from his cookbook for years at home and loved it. Now that I have my own restaurant, I could not not share this dish with my customers. Here's an updated version with modifications I have made throughout the years.
- [Recipe Name] by [creator name] and/or [cookbook name]
- This is my favourite [whatever] recipe. I got it from a chef at [place name]
- I really like this recipe. I got it while visiting [place name]
- I have been using [creator name] recipe from his cookbook for years at home and loved it. Now that I have my own restaurant, I could not not share this dish with my customers. Here's an updated version with modifications I have made throughout the years.