Eu não gosto de ovo cru, mas gosto de cenoura crua na salada.

In Portuguese, gostar normally uses the preposition de before the thing you like.

• gosto de ovo = I like egg / eggs
• gosto de cenoura = I like carrot / carrots

So:

• Eu não gosto de ovo cru = I don’t like raw egg
• mas gosto de cenoura crua = but I like raw carrot

This is just how the verb works in Portuguese. A native English speaker often wants to say gosto ovo, but that is not correct here.

Não is the normal way to make a sentence negative in Portuguese, and it usually goes before the verb.

• Eu gosto = I like
• Eu não gosto = I don’t like

So in your sentence:

• Eu não gosto de ovo cru = I don’t like raw egg

This is very straightforward compared with English: Portuguese does not need do not. It simply puts não before the verb.

Because adjectives in Portuguese usually agree with the noun in gender and number.

• ovo is masculine singular, so: cru
• cenoura is feminine singular, so: crua

That is why you get:

• ovo cru
• cenoura crua

Some more examples:

• pão cru = raw dough-like/undercooked bread context depending
• carne crua = raw meat
• ovos crus = raw eggs
• cenouras cruas = raw carrots

This kind of adjective agreement is very important in Portuguese.

The adjective is cru in the masculine singular form. It does not become cruo.

The basic forms are:

• cru = masculine singular
• crua = feminine singular
• crus = masculine plural
• cruas = feminine plural

So:

• um ovo cru
• uma cenoura crua
• ovos crus
• cenouras cruas

This is just the normal pattern for this adjective.

After gostar de, Portuguese often uses a noun without an article when speaking generally about a food or thing.

So these are natural:

• Gosto de ovo.
• Gosto de cenoura.
• Não gosto de café.

This gives a general meaning, like talking about the food in general.

If you add the article, it can sound more specific, or in some contexts just a little different in tone:

• gosto do ovo cru = I like the raw egg / the raw-egg dish / that specific raw egg situation
• gosto da cenoura crua = I like raw carrot / the raw carrot, sometimes with a more definite feel

For learners, the safest understanding is:

• de + noun with no article often = general meaning
• de + article often = more specific or definite meaning

Yes. In Brazilian Portuguese, Eu can often be omitted when the meaning is clear.

So both are possible:

• Eu não gosto de ovo cru, mas gosto de cenoura crua na salada.
• Não gosto de ovo cru, mas gosto de cenoura crua na salada.

Both are natural.

People may include Eu for emphasis, clarity, contrast, or just speaking style. In this sentence, Eu can help emphasize my preference:

• Eu não gosto de ovo cru, mas gosto de cenoura crua na salada.

Portuguese often leaves out repeated subjects when they are understood.

So:

• Eu não gosto de ovo cru, mas gosto de cenoura crua na salada.

is completely natural. The subject eu is understood in the second clause.

You could also say:

• Eu não gosto de ovo cru, mas eu gosto de cenoura crua na salada.

This is grammatically correct too, but it sounds more emphatic because eu is repeated.

Na is a contraction of em + a.

• em = in
• a = the
• na = in the

So:

• na salada = in the salad

This contraction is very common in Portuguese:

• no = em + o
• na = em + a
• nos = em + os
• nas = em + as

Examples:

• no prato = on/in the plate
• na mesa = on the table
• nas saladas = in the salads

In this sentence, na salada naturally goes with cenoura crua.

So the idea is:

• I don’t like raw egg,
• but I do like raw carrot in salad.

It does not naturally mean that both the egg and the carrot are in the salad. It is attached to the second idea.

If you wanted to make that even clearer, Portuguese could also say:

• ...mas gosto de cenoura crua quando vai na salada.
• ...mas gosto de cenoura crua em salada.

But your original sentence is already clear and natural.

Yes. Mas is the normal word for but in Portuguese.

It connects two contrasting ideas:

• não gosto de ovo cru = I don’t like raw egg
• mas gosto de cenoura crua = but I like raw carrot

So mas works very much like English but here.

Yes, very often they can.

In food-related general statements, Portuguese frequently uses a singular noun to talk about a substance, category, or food in general.

So:

• gosto de ovo
• gosto de cenoura

can mean something like:

• I like egg / eggs
• I like carrot / carrots

The exact English translation depends on context. Portuguese is often less explicit here than English.

Here, gosto is the verb form from gostar:

• eu gosto = I like

There is also a noun gosto meaning taste or sometimes preference:

• O gosto da comida = the taste of the food
• Tem bom gosto = has good taste

So the same written word can be either:

• a verb: I like
• a noun: taste

In your sentence, it is clearly the verb.

In Brazilian Portuguese, gosto is commonly pronounced roughly like GOHS-too, though the exact sound varies by region.

Yes, that is grammatically correct.

• Eu não gosto de ovos crus, mas gosto de cenouras cruas na salada.

This sounds more explicitly plural: raw eggs and raw carrots.

The original version with singular nouns is also very natural when talking about foods in a general sense.

So the difference is mainly one of style and focus:

• ovo cru / cenoura crua = general food category
• ovos crus / cenouras cruas = clearly plural individual items

Both can work depending on what you want to say.