Aquest matí vull una poma amb mel.

Because matí is a masculine singular noun in Catalan, so it takes the masculine singular demonstrative aquest.

• aquest = this (masculine singular)
• aquesta = this (feminine singular)

So:

• aquest matí = this morning
• but aquesta tarda = this afternoon, because tarda is feminine

Yes. Aquest matí is the normal Catalan way to say this morning.

Word by word:

• aquest = this
• matí = morning

Catalan often uses this kind of time expression without any preposition, just like English can say this morning.

Because Catalan, like English, often uses certain time expressions directly, without a preposition.

So you say:

• Aquest matí vull una poma amb mel.

Not usually:

• En aquest matí... for this meaning

Here aquest matí works as a time expression on its own: this morning.

Vull is the 1st person singular present tense of voler, which means to want.

So:

• jo vull = I want

Some other present-tense forms are:

• jo vull = I want
• tu vols = you want
• ell/ella vol = he/she wants
• nosaltres volem = we want

So in the sentence, vull tells you the subject is I, even though jo is not written.

Because Catalan often drops subject pronouns when the verb already makes the subject clear.

So:

• (Jo) vull una poma amb mel. = I want an apple with honey.

Both are possible, but jo is often omitted unless you want emphasis or contrast.

For example:

• Jo vull una poma, però ell vol pa.
  I want an apple, but he wants bread.

In your sentence, leaving out jo sounds natural and normal.

Because poma is a feminine singular noun, so it takes the feminine singular indefinite article una.

• una poma = an apple
• un llibre = a book

So:

• un = a/an for masculine singular nouns
• una = a/an for feminine singular nouns

Amb means with.

So:

• una poma amb mel = an apple with honey

It is the normal Catalan preposition for with in this sentence.

Because mel here is being used as an uncountable substance, like honey in English. When you mean honey in a general sense, Catalan often does not use the article.

So:

• amb mel = with honey

If you said amb la mel, it would sound more like with the honey, meaning some specific honey already known in the conversation.

Yes. The sentence uses a very normal Catalan word order:

• Aquest matí = time expression
• vull = verb
• una poma amb mel = object

So the structure is basically:

Time + Verb + Object

This is very natural in Catalan, especially when you want to start by setting the time: this morning.

Yes, that is possible, but it changes the focus slightly.

• Aquest matí vull una poma amb mel.
  This foregrounds the time: This morning, I want an apple with honey.

• Vull una poma amb mel aquest matí.
  This sounds more like the main point is I want an apple with honey, with this morning added afterward.

Both can work, but the original sentence is very natural if the time is what you want to highlight first.

That depends somewhat on the dialect.

In many traditional pronunciations, ll is a palatal sound, something like the lli sound in some pronunciations of million.

But in some modern varieties, especially in parts of Catalonia, ll can sound more like a y sound.

So vull may sound roughly like:

• vooy or
• a version with a clearer ly-type sound

The important thing for a learner is to recognize that ll in Catalan is a special consonant, and its exact pronunciation can vary by region.

Poma is the standard and most common word for apple in Catalan.

Learners sometimes notice other Romance languages use words related to mela or manzana, but in Catalan the normal word is poma.

So for everyday use, poma is exactly the word you want.

Yes, grammatically it is natural.

It means exactly what it says: Aquest matí vull una poma amb mel.

That said, whether it sounds natural in conversation depends on context, just as in English. People might be more likely to say it in a situation like talking about breakfast or what they feel like eating.

But as a Catalan sentence, it is perfectly normal and correct.