Para desayunar, solo quiero una rebanada de pan con queso y tomate.

Para desayunar means for breakfast or more literally in order to have breakfast.

Spanish often uses para + infinitive to express purpose:

• para comer = to eat / for eating
• para estudiar = to study / for studying
• para desayunar = for breakfast / to have for breakfast

So Para desayunar, solo quiero... is a very natural way to say what you want for breakfast.

You could also hear:

• En el desayuno... = at breakfast / for breakfast
• De desayuno... = less standard in this context

In this sentence, para desayunar sounds very natural and idiomatic.

The comma is used because Para desayunar is an introductory phrase placed at the beginning of the sentence.

Spanish often uses a comma after this kind of fronted phrase, especially when it sets the scene:

• Por la mañana, estudio.
• En verano, vamos a la playa.
• Para desayunar, solo quiero...

You may sometimes see similar short phrases without a comma in informal writing, but here the comma is perfectly normal and helps readability.

Here, solo means only / just.

So:

• solo quiero... = I only want... / I just want...

About the accent:

• Traditional spelling sometimes wrote sólo when it meant only
• Current standard Spanish usually writes solo without an accent, even for only

So solo is the modern standard spelling here.

Be careful: solo can also mean alone, but in this sentence the meaning is clearly only.

Quiero simply means I want. In this sentence, it sounds natural and direct, especially if you are just stating your preference.

• Solo quiero una rebanada... = I just want one slice...
• Me gustaría una rebanada... = I would like a slice...

Both are correct, but the tone is slightly different:

• quiero = more direct, neutral in many everyday contexts
• me gustaría = softer, more polite, more like ordering in a café or restaurant

So this sentence is not wrong at all; it just sounds like someone clearly saying what they want.

Una rebanada de pan means a slice of bread.

Spanish uses de in this kind of structure:

• una taza de café = a cup of coffee
• un vaso de agua = a glass of water
• una rebanada de pan = a slice of bread

So rebanada is the unit, and de pan tells you what the slice is made of.

You cannot say una rebanada pan in standard Spanish. The de is necessary.

Also, un pan usually means a loaf / a bread roll / a piece of bread, depending on context, not specifically a slice of bread.

No. Rebanada is very natural for a slice, especially of bread.

But depending on context, Spanish might also use:

• una loncha = a slice, usually a thin slice of ham, cheese, etc.; less common for bread
• una rodaja = a round slice, like tomato or lemon
• un trozo de pan = a piece of bread
• una tostada = a piece/slice of toasted bread, or toast

So for a slice of bread, una rebanada de pan is a very good choice.

Here, con means with, so:

• pan con queso y tomate = bread with cheese and tomato

That sounds like bread served or topped with those ingredients.

If you used de, it would suggest that the bread is made of or characterized by cheese and tomato in a different way:

• pan de ajo = garlic bread
• pastel de queso = cheesecake
• bocadillo de jamón = ham sandwich

So con is the natural choice when talking about bread eaten with cheese and tomato on it or alongside it.

In Spanish, when talking about ingredients or foods in a general sense, articles are often omitted after con.

So:

• pan con queso y tomate sounds natural as bread with cheese and tomato

If you said:

• con el queso y el tomate that would usually refer to specific cheese and tomato already known in the conversation:
• the cheese
• the tomato

In this sentence, the speaker just means the ingredients in general, so no article is needed.

Yes, tomate y queso would also be grammatically correct.

The order of items in a list can depend on:

• what sounds more natural to the speaker
• which item they think of first
• emphasis
• common collocations

Both of these are fine:

• pan con queso y tomate
• pan con tomate y queso

There is no grammar rule forcing only one order here.

Desayunar is a verb meaning to have breakfast.

Examples:

• Desayuno a las ocho. = I have breakfast at eight.
• Voy a desayunar. = I’m going to have breakfast.

Desayuno can be:

1. the noun breakfast
   • El desayuno está listo. = Breakfast is ready.
2. the first person singular of the verb
   • Yo desayuno temprano. = I have breakfast early.

So in Para desayunar, the infinitive desayunar is being used after para.

In Spain, a standard pronunciation would be roughly:

• desayunar → deh-sah-yoo-NAR
• tomate → toh-MAH-teh

A couple of useful notes:

• The stress in desayunar is on the last syllable: -nar
• The stress in tomate is on ma
• The y in desayunar sounds like the English y in yes
• The d in desayunar may sound softer than English d, especially between vowels

If you are learning Peninsular Spanish, this pronunciation is what you should aim for.

Yes, you could, but the meaning becomes less specific.

• Solo quiero una rebanada de pan con queso y tomate = I only want one slice of bread with cheese and tomato
• Solo quiero pan con queso y tomate = I only want bread with cheese and tomato

So una rebanada de tells us the exact amount. Without it, the sentence is more general.