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Open the recipe, and there is a purchase ingredient under the recipe in the middle. Click on it to see the ingredients.
When upgrading a recipe, if you have 2 ingredients and the number of cooking servings is enough, you will be prompted to buy (5M coins).
Enter your own kitchen first, and then order the recipe, all your dishes will be listed below, there is a prompt below the icon of the dish, lock unlocked, if it is not locked, it will show lock, and after clicking on the lock on the icon of the dish, a small lock will be displayed, and you can do it.
1 Before upgrading, make sure that you have prepared all 3 ingredients for the upgraded dish. (One less ingredient can be purchased for 5M to buy all-purpose ingredients). >>>More
It certainly doesn't hurt to lock it all up, because every ingredient is hard to come by >>>More
It's okay now, but you have to pay M coins to tell you that upgrading recipes won't fail, but developing recipes may fail.