So I got a mug of water in my left hand and a smartphone in the other ¶
.

They were a pre-cooked products. ¶

There is more than one cutlet.

But I changed my mind because the fire could burn the kitchen set. ¶

Story about how I fryied a cutlet

I stood at the stove and fried a cutlet in butter. ¶

Also in my left hand there wasI was holding a mug of some water and in my other - a smartphone. left hand, and a smartphone in the other.¶

I changed your sentence to make it sound more natural

While I cooked, II was talkeding to my wife by phone. on the phone while I fried my cutlet.¶

I think you should stick to fry instead of cook. Frying something implies that you are cooking something in oil, while cooking doesn't really imply that you are cooking something in oil. Also since you used fry, I think you should stick with the same verb.

It was a semi-finished profduct. ¶

And she told me: "just a little drip somedd a few drops of water".

If your wife said it, you should use quotes ( " ... ")

OkSo, I have some water in the mug in my hand. got a mug of water. ¶

You should use 'so' here because it continues the action of your previous sentence (your wife told you to add water). Also you don't need to repeat hand because we know you are holding it in your hand.

It looked like a fire-breathing dragon cutlet burned the ceiling. ¶

So I dripppoured some water on my cutlet... ¶

But I change my mind to do it because the fire could burn the kitchen set. ¶

Fortunately, the fire has gone. went out.¶

I was in a panic. king¶

After this situation my hands wasere shaking. ¶

I took adecided to take the frying pan, and I made up my mind to fill it with water full in the kitchen sink. rinse it with water. ¶

This sentence is more natural

Well, that granny, whom I rented a room to, hadn't seen this terrible picture.

Story about how I fryied a cutlet

I stood at the stove and fried a cutlet in butter. ¶

While I cooked, I talked to my wife byon the phone. ¶

It was a semi-finished profduct. ¶

Instead of "semi-finished", try either "pre-made" or "pre-cooked" to sound more natural. That might be an American thing, though, I've never heard "semi-finished" before.

And when I fry thatose semi-finished cutlets, ithey usually goes to pieces. ¶

I didon't want ithat, so I asked my wife: how can I avoid it. ¶

And she told me: just a little drip somefew drips of water.

Suddenly, a column of fire was taken up before me inblazes up in front of me, up to the ceiling. ¶

But I change my mind to do it because the fire could burn the kitchen set. ¶

Fortunately, the fire has gone. went out.¶

After this situation my hands wasere shaking. ¶

Well, that granny, whom I rented a room, hadn't seen this terrible picture.

Luckily or Fortunately would fit better than "well", I think. :)
Maybe also a "yet" added to the very end! Haha!

If you're renting a room to the granny, this makes sense.
But if granny is the landlord, you need to say "from whom I rented a room"