Although Allen had already expected it since it was french fries that were created by a Supreme Being, it was still shocking for him to know that such heavenly french fries could only be created using those foreign ingredients.
But from what Allen had tasted from the french fries, it wasn't difficult for him to cultivate divine potatoes using his <Supreme Farmer> but it was quite difficult for him to create salt from the celestial ocean.
It was not impossible since if he was given time to taste more of that salt, he could recreate it using his <Supreme Creator> or at least something that isn't inferior to it. The only problem was that it will take quite a considerable amount of time.
And from his current amount of french fries in his pile, it was enough to eat all of it and find out about the components of the celestial ocean salt.