A szósz és a köret egyaránt finom.

In Hungarian, the verb to be is usually left out in the present tense when the subject is third person and the sentence simply links the subject to a description.

So:

• A szósz finom. = The sauce is tasty.
• A köret finom. = The side dish is tasty.
• A szósz és a köret egyaránt finom. = The sauce and the side dish are both tasty.

But in other tenses, or with first/second person, the verb appears:

• Finom volt. = It was tasty.
• Én fáradt vagyok. = I am tired.

So the missing are is completely normal here.

Hungarian often repeats the definite article before each noun in a coordinated phrase.

So:

• a szósz és a köret = the sauce and the side dish

This is very normal and natural in Hungarian. English often uses the only once, but Hungarian commonly uses a / az with each noun if both are definite.

You may sometimes see structures where the article is not repeated, but in a sentence like this, repeating it is the standard, natural choice.

Egyaránt means equally, likewise, or in this kind of sentence, both.

In A szósz és a köret egyaránt finom, it tells you that the statement applies to both items:

• the sauce is tasty
• the side dish is tasty too

So a very natural English translation is:

• The sauce and the side dish are both tasty.

It adds the idea that the same description fits each item.

In this sentence, egyaránt comes before the adjective:

• A szósz és a köret egyaránt finom.

This is a very natural placement.

It often appears in patterns like:

• X és Y egyaránt + adjective
• X és Y egyaránt + verb

For example:

• Péter és Anna egyaránt fáradt. = Péter and Anna are both tired.
• A fiúk és a lányok egyaránt élvezik. = Both the boys and the girls enjoy it.

You may occasionally see other word orders in special contexts, but the position used here is the one learners should treat as the normal model.

Because Hungarian adjectives used predicatively do not agree in number with the subject the way English verbs do.

So even with two things:

• A szósz és a köret finom.

the adjective stays finom, not a plural form.

This is normal in Hungarian. The adjective does not change here.

Compare:

• A leves finom. = The soup is tasty.
• A levesek finomak. = The soups are tasty.

Notice that when the subject itself is plural (levesek), the adjective can take plural marking (finomak). But in your sentence, the subject is a coordination of two singular nouns, and Hungarian commonly keeps the predicate adjective singular in this kind of neutral statement.

Yes, but it is not exactly the same in nuance.

• A szósz és a köret egyaránt finom. strongly means both are tasty
• A szósz és a köret is finom. can also mean something like the sauce and the side dish are tasty too / as well

The particle is often adds the sense of also / too. So it may depend more on context.

If you specifically want the clear sense of both, egyaránt is a very good choice.

Because egyaránt most naturally comes before the adjective or verb it affects.

So:

• A szósz és a köret egyaránt finom. = natural
• A szósz és a köret finom egyaránt. = possible only in marked or unusual style, and not the normal learner pattern

For everyday Hungarian, use the version with egyaránt before finom.

Yes. És is the standard Hungarian word for and.

So:

• a szósz és a köret = the sauce and the side dish

It is used very widely, just like English and.

Learners sometimes also notice meg, which can sometimes act like and in speech or in certain sentence structures, but és is the basic conjunction to learn first, and it is exactly what you would expect here.

A rough guide for English speakers:

• sz is pronounced like English s
• s by itself is pronounced like English sh
• ó is a long o
• ö is similar to the vowel in German schön or French peu, if you know those
• á is a long open a

So roughly:

• szósz ≈ sohss with a long o
• köret ≈ something like kuh-ret, but with Hungarian ö, not a plain English u
• egyaránt ≈ edyuh-raant very roughly

A few extra pronunciation notes:

• gy is a single consonant sound, somewhat like the d in British duke or during, but softer
• stress in Hungarian is always on the first syllable, so:
  • SZÓSZ
  • KÖ-ret
  • Egy-a-ránt

Here finom is an adjective meaning tasty, delicious, or fine depending on context.

In this sentence it functions as a predicate adjective, meaning it describes the subject:

• A szósz és a köret = the subject
• finom = what is said about the subject

So the structure is basically:

• The sauce and the side dish — both tasty.

with the present-tense to be understood.

Yes. It sounds natural and standard.

It is a nice, neutral way to say that both items are tasty:

• A szósz és a köret egyaránt finom.

It would work well in everyday conversation, restaurant talk, food reviews, or general comments about a meal.

If you wanted a slightly simpler sentence, you could also say:

• A szósz és a köret is finom.

But the original sentence is perfectly natural and slightly more precise in expressing both alike.