Para a sopa, eu quero um quilo de batata e um quilo de cebola.

Para a sopa means for the soup. It gives the purpose or context first: what the ingredients are for.

In Portuguese, it is very natural to begin a sentence this way:

• Para a sopa, eu quero...
• Para o jantar, eu preciso...
• Para a receita, falta açúcar.

It helps frame the sentence before saying what is wanted or needed.

Portuguese often uses the definite article where English might not.

So:

• para a sopa = for the soup

Even if English might say for soup or for the soup depending on context, Portuguese commonly prefers a sopa here. Using the article sounds natural and complete.

Yes. In Brazilian Portuguese, eu is often optional because the verb form already shows the subject.

So both are correct:

• Para a sopa, eu quero um quilo de batata...
• Para a sopa, quero um quilo de batata...

Including eu can add emphasis, clarity, or a more explicit tone, but it is not required.

Eu quero literally means I want, and in many everyday situations in Brazil it can be completely normal, especially in simple shopping or conversational contexts.

Still, depending on tone and situation, people may also say:

• Eu queria... = I would like...
• Eu gostaria de... = I would like... (more formal/polite)

So:

• Eu quero um quilo de batata is direct and common.
• Eu queria um quilo de batata sounds softer.

After words that express quantity, measure, or container, Portuguese usually uses de before the thing being measured.

Examples:

• um quilo de batata
• meio quilo de arroz
• um litro de leite
• uma caixa de chocolate

So de here works like of in English:

• a kilo of potatoes
• a kilo of onions

After measurements like um quilo de, Portuguese often uses the noun in the singular when talking about a food item or substance in a general, bulk sense.

So these are natural:

• um quilo de batata
• um quilo de cebola
• um quilo de tomate

Even though English often says a kilo of potatoes/onions, Portuguese commonly keeps the noun singular in this kind of phrase.

You may also hear plurals in some contexts, but the singular is very standard and natural here.

Yes, you may hear that, and native speakers do sometimes use the plural, especially when thinking of countable individual items. But in Brazilian Portuguese, the singular after a unit of measure is very common and usually the safest choice for learners.

So:

• um quilo de batata = very natural
• um quilo de cebola = very natural

If you use the plural, people will still understand you, but the singular is often the more standard phrasing in this kind of shopping sentence.

Because quilo is a masculine noun:

• o quilo
• um quilo

So the article/number must match its gender:

• um quilo
• not uma quilo

This has nothing to do with batata or cebola being feminine. The article agrees with quilo, not with the food that comes after.

Portuguese normally puts the quantity expression first, then de, then the noun:

• um quilo de batata
• dois litros de água
• três caixas de morango

That is the standard structure. Putting batata first would sound unnatural in this context.

After a measure phrase like um quilo de, Portuguese usually does not use an article before the noun.

So:

• um quilo de batata
• um quilo de cebola

Not normally:

• um quilo da batata
• um quilo da cebola

Using da would suggest a more specific meaning, like a kilo of the potatoes or a kilo of the onion, which is not what this sentence is doing.

In Brazilian Portuguese, batata usually means potato. By default, if someone says batata, people understand the regular potato.

If you want to specify sweet potato, that is:

• batata-doce

So in this sentence, batata means ordinary potato.

It is not always absolutely required, but it is very natural and helpful. The comma separates the introductory phrase from the main part of the sentence:

• Para a sopa, eu quero um quilo de batata...

It makes the sentence easier to read and reflects a natural pause.

A broad, learner-friendly pronunciation guide would be:

PA-ra a SO-pa, eu KE-ro um KEE-loo dji ba-TA-ta i um KEE-loo dji se-BO-la

A few useful notes:

• eu often sounds a bit like eh-o compressed together
• qu in quilo sounds like k
• de often sounds like dji before words like batata and cebola in Brazilian Portuguese
• e often sounds like i in connected speech: batata e um quilo...

Pronunciation varies by region, but this is a good general Brazilian pattern.

Yes, absolutely. It sounds like something someone might say when buying ingredients.

In a market, a person might also say:

• Quero um quilo de batata e um quilo de cebola.
• Vou levar um quilo de batata e um quilo de cebola.
• Me vê um quilo de batata e um quilo de cebola. (very colloquial in some places)

So the sentence is practical and natural for everyday use.

Yes. In spoken Brazilian Portuguese, para is very often reduced to pra.

So you will commonly hear:

• Pra sopa, eu quero um quilo de batata e um quilo de cebola.

This is very natural in speech and informal writing.
In more careful or formal writing, para a sopa is preferred.

E means and. It simply connects the two things wanted:

• um quilo de batata
• e
• um quilo de cebola

Just like English, Portuguese uses e to join words or phrases in a list.

You would change the number before quilo:

• dois quilos de batata
• três quilos de cebola

Notice that quilo becomes plural:

• um quilo
• dois quilos

So for example:

• Para a sopa, eu quero dois quilos de batata e um quilo de cebola.