A Maria pediu uma omelete com queijo e tomate, mas eu preferi uma sandes de presunto.

In European Portuguese, it is very common to use the definite article before a person’s name, especially in everyday speech.

So:

• A Maria = Maria
• O João = João

This does not mean the Maria in natural English. It is just a normal Portuguese feature.

In Portugal, using the article with first names is very common and natural. In English, we usually do not do this, so it often feels strange at first.

Pediu is the preterite form of pedir, which usually means to ask for or to order.

In this sentence:

• A Maria pediu uma omelete... = Maria ordered an omelette...

In a restaurant or café context, pedir is the normal verb for ordering food.

A few related forms:

• pedir = to ask for / to order
• pedi = I ordered
• pediu = he/she/you (formal) ordered

So pediu tells us this was a completed action in the past.

Because both nouns are feminine singular in Portuguese:

• uma omelete = an omelette
• uma sandes = a sandwich

The article uma is the feminine singular form of a/an.

Compare:

• um café = a coffee
• uma sopa = a soup

So here the grammar matches the gender of the nouns.

Com queijo e tomate means with cheese and tomato.

It describes the omelette:

• uma omelete com queijo e tomate = an omelette with cheese and tomato

Notice that Portuguese does not need to repeat com before each item:

• com queijo e tomate = with cheese and tomato

This works just like English.

Mas means but.

It introduces a contrast:

• A Maria pediu uma omelete...
• mas eu preferi uma sandes...

So the idea is:

• Maria chose one thing,
• but I chose something different.

This is a very common coordinating conjunction in Portuguese.

Preferi is the preterite of preferir, meaning to prefer.

Here it means something like:

• I preferred
• or more naturally in context, I chose instead

So:

• mas eu preferi uma sandes de presunto
  = but I preferred / chose a ham sandwich

Because it is in the preterite, it refers to a completed choice in the past.

Yes, it could be omitted.

Portuguese often leaves out subject pronouns because the verb form already shows who the subject is:

• preferi already tells us it means I preferred

So both are possible:

• mas eu preferi...
• mas preferi...

Including eu adds emphasis or contrast. In this sentence, it highlights the difference between Maria’s choice and the speaker’s choice:

• Maria ordered X, but I preferred Y.

So eu is not required, but it is meaningful.

In Portuguese, de is often used to name a type of food, especially sandwiches and similar items.

So:

• uma sandes de presunto = a ham sandwich
• literally, a sandwich of ham

This is the most natural way to describe the kind of sandwich.

If you said uma sandes com presunto, it would sound more like:

• a sandwich with ham in it

That is grammatically possible, but de presunto is the more idiomatic choice when naming the sandwich.

Sandes means sandwich, and in European Portuguese it is very commonly used.

A useful thing to know is that sandes is usually the same in the singular and plural:

• uma sandes = a sandwich
• duas sandes = two sandwiches

It is also normally treated as feminine:

• a sandes
• uma sandes

This word is especially associated with Portugal. A learner may also see other words in other varieties of Portuguese, but sandes is very normal in European Portuguese.

Yes, it sounds very much like European Portuguese for a couple of reasons.

For example:

• A Maria — using the article before a first name is very typical in Portugal
• sandes — this is a very common European Portuguese word

So even if the sentence is understandable more broadly, it has a clear European Portuguese feel.

Because in this kind of food description, Portuguese often leaves out the article.

So:

• com queijo e tomate = with cheese and tomato
• de presunto = of ham / ham

This is similar to English, where we also usually say:

• with cheese and tomato
• a ham sandwich

rather than:

• with the cheese and the tomato

The zero article sounds natural because we are talking about ingredients in a general way, not specific individual items.

The sentence has two main parts joined by mas:

1. A Maria pediu uma omelete com queijo e tomate
2. mas eu preferi uma sandes de presunto

So the structure is roughly:

• Subject + verb + object
• but + subject + verb + object

Breaking it down:

• A Maria = subject
• pediu = verb
• uma omelete com queijo e tomate = object

and then:

• eu = subject
• preferi = verb
• uma sandes de presunto = object

This is a very straightforward and common Portuguese sentence pattern.

You may see variation depending on the variety of Portuguese or the dictionary, but in European Portuguese omelete is a normal spelling.

So in this sentence:

• uma omelete = an omelette

For a learner, the important thing is simply to recognize it as the standard word for omelette in Portuguese.