بعد ما حطيت البندورة والبصل بالطبخة، سكرت الباب وفتحت الشباك.

It is clearly Levantine Arabic.

Some clues:

• حطّ is the everyday Levantine verb for to put
• بندورة is a common Levantine word for tomato
• شباك is the everyday Levantine word for window
• سكّر is a common spoken verb meaning to close

In Modern Standard Arabic, you would expect words like:

• وضع for put
• نافذة for window
• أغلق for close

So this sentence sounds natural in spoken Levantine, not formal MSA.

بعد ما means after or after having when it is followed by a verb clause.

So:

• بعد ما حطيت... = after I put...

This is a very common spoken Levantine structure:

• بعد ما أكلت = after I ate
• بعد ما وصلنا = after we arrived

It introduces an action that happened first, before the main action in the sentence.

No. Here, ما is not negation.

In this sentence, بعد ما is a fixed expression meaning after. So you should learn it as one chunk.

That means:

• بعد ما حطيت... does not mean after I didn’t put
• it simply means after I put

This is a common source of confusion because ما can mean different things in different contexts.

حطيت is the past tense of the Levantine verb حطّ, which means to put, to place, or often to add.

In cooking, حطّ is extremely common. It is much more natural in speech than a more formal verb like وضع.

So:

• حطيت البندورة والبصل = I put / added the tomato and onion

In everyday Levantine, حطّ is one of the basic high-frequency verbs you will hear all the time.

It can mean either one, depending on context.

In Levantine past tense, the form حطّيت can be:

• I put
• you put to one male

The same is true for:

• سكرت
• فتحت

So this whole sentence, by form alone, could theoretically be understood as:

• After I put..., I closed... and opened... or
• After you put..., you closed... and opened...

Usually context tells you which one is meant. If needed, speakers can add the pronoun:

• أنا حطيت = I put
• إنت حطيت = you put

Because Arabic often drops subject pronouns when the verb already shows the subject.

In English, you usually need:

• I put
• I closed
• I opened

In Arabic, the verb form itself often carries that information, so saying أنا every time is unnecessary.

That is why you get:

• حطيت
• سكرت
• فتحت

without repeating أنا.

This is very normal and natural in Arabic.

بالطبخة literally means something like in the dish, in the cooking, or into the dish being cooked.

Breakdown:

• بـ = in / into / with, depending on context
• الطبخة = the dish, the cooked meal, the thing being cooked

In a cooking context, حطيت البندورة والبصل بالطبخة means:

• I added the tomato and onion to the dish
• I put the tomato and onion into what I was cooking

So the English translation may use in, into, or to, depending on what sounds most natural.

In Arabic, ingredient nouns are very often used with the definite article الـ in contexts like this.

So:

• البندورة
• البصل

can sound perfectly natural even when English would simply say:

• tomato
• onion or
• tomatoes and onions

In cooking language, Arabic often treats these as the known ingredients being discussed. So the definite form is very common and does not always map neatly onto English the.

Both patterns can exist in Arabic, but the version in your sentence sounds very natural.

Yes, depending on context, it can.

In spoken Levantine, ingredient words are often used in a flexible way:

• sometimes as a clear singular noun
• sometimes more like a category or ingredient name

So in cooking speech, البندورة may refer to tomato as an ingredient, not necessarily exactly one whole tomato in the English sense.

Also:

• بصل often behaves like a mass noun, similar to onion as an ingredient
• if someone wanted to be very explicit about plural tomatoes, they could say بندورات

But in everyday cooking talk, the sentence as written is very natural.

They are both past tense verbs:

• سكّرت = I closed / you closed
• فتحت = I opened / you opened

They are connected by و meaning and:

• سكرت الباب وفتحت الشباك = I closed the door and opened the window

This kind of verb chaining is very common in Arabic. You do not need to repeat the subject before each verb.

So the structure is simply:

• first action
• and
• second action

Basically it means and, but in a sentence like this it naturally gives a sense of sequence.

Because the sentence already starts with بعد ما = after, the listener expects a chain of completed actions:

• after I put the ingredients in,
• I closed the door
• and opened the window

So و is just and, but in narration it often feels like and then even if Arabic does not say then explicitly.

Because ش is a sun letter.

When الـ comes before a sun letter, the l sound assimilates to the next consonant. So:

• الشباك is pronounced ish-shubbāk or ash-shubbāk, depending on accent and transcription style

But it is still written الشباك.

By contrast:

• الباب keeps the l sound, because ب is a moon letter
• so الباب is pronounced more like il-bāb or el-bāb

This is a pronunciation rule, not a spelling change.