Se quiseres, faço-te uma torrada com presunto e pepino.

Because after se when it means if, Portuguese often uses the future subjunctive, not the ordinary present tense.

• queres = you want / you want to
• quiseres = if you want

So:

• Se queres... can exist, but it usually sounds more like if it is true that you want... or can feel less natural here.
• Se quiseres... is the normal way to say if you want / if you’d like.

This is a very common pattern in Portuguese:

• Se puderes, liga-me. = If you can, call me.
• Se tiveres tempo, vem. = If you have time, come.

Quiseres is the future subjunctive of querer for tu.

The verb querer is irregular, so the form does not look like quer-.

A few forms of the future subjunctive are:

• se eu quiser
• se tu quiseres
• se ele/ela quiser
• se nós quisermos
• se vós quiserdes
• se eles/elas quiserem

In this sentence, the speaker is talking to one person informally, so tu quiseres is used.

Because te is an unstressed object pronoun, and in European Portuguese it is often attached to the verb after it. This is called enclisis.

So:

• faço-te = I make you / I make for you

The hyphen shows that the pronoun is attached to the verb.

This is very typical of Portuguese from Portugal:

• dou-te
• digo-te
• levo-te

In many cases, European Portuguese prefers this verb + pronoun order unless something pulls the pronoun before the verb.

Grammatically, te is you (informal singular object), but in English we often translate it more naturally as for you in this kind of sentence.

So faço-te uma torrada literally looks like:

• I make you a toast

But natural English is:

• I’ll make you some toast
• I’ll make you a toast
• I’ll make you a toasted sandwich

depending on context.

So te is the indirect object: the person benefiting from the action.

Portuguese often uses the present tense to talk about a near future action, especially in everyday speech.

So:

• Se quiseres, faço-te uma torrada.

can mean:

• If you want, I’ll make you some toast.

This is very natural. Portuguese does not always need a separate future form here.

You could also say:

• Se quiseres, faço-te...
• Se quiseres, vou fazer-te...
• Se quiseres, far-te-ei... (much less common in ordinary speech)

The simple present is the most natural conversational choice here.

Because quiseres and te show that the speaker is addressing someone with tu, the informal singular you used in Portugal.

Clues:

• quiseres = tu form
• te = object pronoun for tu

So this sentence is informal and friendly, such as speaking to a friend, partner, child, sibling, etc.

If the speaker were using você, the sentence would change, for example:

• Se quiser, faço-lhe uma torrada...

That sounds more formal or more distant.

Yes, absolutely.

• faço-te uma torrada
• faço uma torrada para ti

Both are correct.

The version with te is more compact and very natural in Portuguese.
The version with para ti is more explicit and can add emphasis:

• I’ll make a toast for you

You can even combine them in some contexts for emphasis, but normally one is enough.

In Portugal, uma torrada usually means a slice of bread or bread roll toasted and buttered, often served in cafés.

It is not necessarily the same as British a piece of toast in every context, and it is not the same as a toasted sandwich.

Very roughly:

• torrada = toast
• tosta = toasted sandwich / sandwich toastie

So in this sentence, uma torrada com presunto e pepino sounds a little like toast with ham and cucumber or possibly a prepared toasted bread item with those toppings/fillings, depending on context.

In Portugal, presunto usually means cured ham, similar to prosciutto or jamón, not ordinary sliced cooked ham.

So this is an important vocabulary point:

• presunto = cured ham
• fiambre = cooked ham / deli ham

A learner might expect presunto to mean any ham, but in Portugal it usually refers to the cured kind.

Yes, pepino means cucumber.

As for how natural it sounds with presunto, that depends on personal taste more than grammar. Grammatically, the phrase is completely fine:

• com presunto e pepino = with cured ham and cucumber

Portuguese often uses com to list ingredients or fillings very simply.

Because Se quiseres is an introductory conditional clause:

• If you want, ...

In English, we also usually put a comma after an initial if clause:

• If you want, I’ll make you...

Portuguese punctuation works similarly here, so the comma helps separate the condition from the main clause.

Yes. Depending on tone and context, Se quiseres can be translated as:

• If you want
• If you’d like
• If you feel like it
• If you want me to

In this sentence, it sounds like a friendly offer, so English might naturally use:

• If you want, I’ll make you toast with ham and cucumber.
• If you like, I’ll make you some toast with ham and cucumber.

Yes, it strongly looks like European Portuguese.

The biggest clue is faço-te. In European Portuguese, attaching the pronoun after the verb is very common:

• faço-te

In Brazilian Portuguese, people would more often say:

• Se você quiser, faço uma torrada para você
• Se quiser, eu te faço uma torrada

So the sentence is very natural for Portugal.

The ç is called cê cedilha. It shows that the c is pronounced like s before a, o, or u.

So:

• faço is pronounced roughly FAH-soo in European Portuguese, though the final vowel is much reduced.

Without the cedilla, faco would suggest a different sound, so ç is needed.

This also appears in words like:

• coração
• almoço
• começo

Some parts can change, but the original order is very natural.

Standard version:

• Se quiseres, faço-te uma torrada com presunto e pepino.

Possible alternatives:

• Se quiseres, faço uma torrada com presunto e pepino para ti.
• Faço-te uma torrada com presunto e pepino, se quiseres.

The first keeps the same meaning but uses para ti instead of te.
The second moves the conditional phrase to the end, which is also possible.

So the sentence is not completely fixed, but the given version is idiomatic and natural.