Is it understandble to say this...?

I cannot paraphrase this because I simply don't know what it means. It is more than odd.

"Had I sentenced anything in a wrongful grammar, please feel free to correct it."

We don't use "sentencing" that way. A judge sentences a criminal (e.g. to a spell in prison)

"Wrongful" does not mean the same as "wrong"

We don't use "grammar" that way either.

I'd have to agree with Rog,

unclear. I presume however that you were doing your last in preparing the mixture; that is, you were still adding stuff. But still why cap the IN?

Thanks contrex. Language is perhaps a lot harder to decode more than any sophisticated area of knowledge. (For me anyway)
In a noun form, sentence can refer to that of the Linguistics, Law, Music, Christianity, Christianity, Philosophy.. etc. However, only of the law could verbalize this. There is freedom to speech but not much to words.

Having checked the dictionary, I can see why wrongful is also faulty in this usage. But may I ask why the word "grammar" can't be used that way?

dalehileman,
Yes, I was stirring the mixture for the last time. I capitalize the prepositions for emphasis.

Doing so makes no sense. It confuses the reader. Nowhere else is that done.

Also, even without capitalizing it still makes no sense grammatically.

This phrasing could make more sense. Not sure if this is what was meant:

"I was adding my last ingredient to the mixture when he called. So, quickly I took the time to ask whether he'd want chocolate chips in it or not."

Ragman, may I ask why it confuses the reader?

Is this what you mean:

I was adding the last ingredient to the mixture when he called, so I quickly grabbed the opportunity to ask whether he'd want chocolate chips in it or not.

The setting might be: A person is making cookies and gets a call from her friend so she is able to ask him if he wants chocolate chips in the cookies.

I'll let Ragman explain that. But let me add that the expression "grabbed the time" is also never used in the idiomatic sense that you seem to mean it. "Took the time" would be more acceptable, but, in this case, also unusual. How much time does it take to ask a simple question?

Until one gains essential insight for future guidance.

Lustig Andrei, when you want to imply a very busy scenario and an unexpected moment popped up, why 'grabbed the time' can't be used?

it is by the way,

"I was doing my last STIR IN the mixture..." I am sorry for that missing word STIR.

This sentence needed a verb. 'Stirring the last ingredient in the mixture' is what I suggest is what was missing. No capitalization of the word 'in' is appropriate.

It's not that it can't be used, just that in standard English it isn't generally used. In a poetic sense, perhaps, but not in normal prose writing.

Thanks for your suggestion Ragman.

Lustig Andrei,
Thanks for sharing.