Learning in guild cities can be obtained. If you join a high-level guild, basically all the guild cities with level 5 have developed cooking recipes with level 6 or above.

Another method is to open the box in the wild and get it at random.

To sum up, you can get it in three ways:

1, unpacking on site.

2. Buy in the guild city (you need a certain amount of gold coins and tributes).

3. Buy in the hands of other players or at the booth.