Para la sopa, mi madre corta puerro y apio antes de poner la olla al fuego.

Para la sopa gives the purpose or context: for the soup / for making the soup.

In Spanish, it is very common to put this kind of phrase at the beginning to set the scene:

• Para la ensalada, corto tomate y cebolla.
• Para el desayuno, siempre hago tostadas.

So here, Para la sopa means that the leek and celery are being cut as ingredients for the soup.

Because para usually expresses purpose, intended use, or destination.

Here, the vegetables are being cut for the soup, meaning they are going to be used in it. That fits para.

• para la sopa = for the soup / intended for the soup

If you used por, it would usually suggest something like because of, through, along, or by means of, which does not fit here.

Spanish often uses the present tense to talk about:

• habitual actions
• general routines
• recipe-style or instructional actions
• vivid narration

So mi madre corta puerro y apio means something like:

• my mother cuts leek and celery
• my mother is in the habit of cutting leek and celery
• my mother cuts leek and celery before...

It sounds natural if you are describing what she typically does when making soup.

Yes, it could be omitted.

Spanish often leaves out subject pronouns and even noun subjects when they are clear from context. You could say:

• Para la sopa, corta puerro y apio antes de poner la olla al fuego.

But that would only work if it is already obvious who she is.

Including mi madre makes the sentence clearer and more explicit. It also slightly emphasizes my mother as the person who does this.

Here they are being used as ingredient names or mass-style nouns, not to count individual units.

This is very common in Spanish when talking about food ingredients:

• corto cebolla
• añado zanahoria
• lleva tomate

That does not necessarily mean exactly one leek or one celery. It means leek and celery as ingredients.

In English we do something similar sometimes with food words, though not always in exactly the same way.

Because in Spanish, when talking about ingredients in a general culinary way, the article is often dropped.

So:

• corta puerro y apio = cuts leek and celery

This sounds like recipe language or ingredient language.

You could also hear:

• corta el puerro y el apio

That version sounds more like specific, identifiable items: the leek and the celery.

So the difference is roughly:

• puerro y apio = ingredients in general
• el puerro y el apio = specific leek and celery already understood in the situation

Both can be grammatical, but the version without articles is very natural in cooking contexts.

Yes, it would be correct.

The version with articles:

• corta el puerro y el apio

sounds more like you are referring to specific vegetables that are present or already known.

The version in your sentence:

• corta puerro y apio

sounds a bit more generic and recipe-like, focusing on the ingredients rather than on individual objects.

So this is more a matter of style and nuance than strict right versus wrong.

Because after antes de, Spanish normally uses an infinitive when there is no new subject introduced.

• antes de poner la olla al fuego = before putting the pot on the heat

This structure is very common:

• antes de salir
• antes de comer
• antes de empezar

So antes de + infinitive is the normal pattern here.

You use antes de que when a new clause follows, usually with a different subject, and the verb after it normally goes in the subjunctive.

Compare:

• Antes de poner la olla al fuego...
  = before putting the pot on the heat
  → infinitive, no separate subject stated

• Antes de que mi madre ponga la olla al fuego...
  = before my mother puts the pot on the heat
  → full clause with subject + subjunctive

So in your sentence, antes de poner is shorter and more natural because it refers to the same general action sequence.

It means to put the pot on the heat, basically to put the pot on the stove / begin heating it.

This is a very common expression in Spanish cooking language:

• poner al fuego
• poner al horno
• poner a cocer

Here al fuego does not have to mean literal flames only. In modern usage it can simply mean placing the pot over the heat source to start cooking.

Because poner algo al fuego is the standard idiomatic expression.

• al = a + el
• poner la olla al fuego = put the pot onto the heat / on the stove

If you said en el fuego, it would sound more like in the fire, which is usually not what you mean in a normal kitchen context.

So this is one of those expressions that is best learned as a chunk:

• poner al fuego

Because a + el contracts to al in Spanish.

So:

• a + el fuego → al fuego

This contraction is mandatory in normal Spanish, except when el is part of a proper name.

Examples:

• Voy al mercado.
• Se acerca al coche.
• Pone la olla al fuego.

The other common contraction is:

• de + el → del

Because here it refers to a specific pot involved in the cooking process.

Spanish often uses the definite article where English might use:

• the
• a possessive
• or sometimes no article at all

In this sentence, la olla means the pot, the one being used for the soup.

It sounds natural because the context makes the pot identifiable.

Yes. Spanish word order is flexible.

For example:

• Mi madre corta puerro y apio para la sopa antes de poner la olla al fuego.

That is also grammatical.

Putting Para la sopa at the beginning gives it topical emphasis, as if saying:

• As for the soup...
• For the soup...

So the original order helps frame the sentence from the start.

Yes, very much so.

Several features make it sound natural in a cooking context:

• ingredient-style nouns without articles: puerro y apio
• present tense for habitual or procedural action: corta
• a common cooking expression: poner la olla al fuego

Spanish often describes cooking actions in a straightforward, practical way like this.

• puerro = leek
• apio = celery

Both are masculine singular nouns:

• el puerro
• el apio

In your sentence they appear without the article because they are being used as ingredients.

It is natural in Spain, especially because olla and poner al fuego are very normal in Peninsular cooking language.

That said, most of the sentence would also be understood perfectly in Latin America. The main differences across regions would usually be vocabulary preferences in some cooking contexts, not the grammar here.

So this sentence is good standard Spanish, and it sounds perfectly natural for Spain.