Ražnjići su pored pljeskavica.

You can tell ražnjići is plural in two ways:

• the noun ending -i is a common masculine plural ending
• the verb su means are, so it agrees with a plural subject

The singular would be ražnjić.

So:

• ražnjić je ... = the skewer/kebab is ...
• ražnjići su ... = the skewers/kebabs are ...

Su is the 3rd person plural form of the verb biti (to be) in the present tense.

Here it matches the plural subject ražnjići.

A quick comparison:

• ja sam = I am
• ti si = you are
• on/ona/ono je = he/she/it is
• mi smo = we are
• vi ste = you are
• oni/one/ona su = they are

So Ražnjići su ... literally means The skewers are ...

Ražnjići is in the nominative plural because it is the subject of the sentence.

In Serbian, the subject of a sentence is normally in the nominative case.

So here:

• ražnjići = nominative plural subject
• su = plural verb
• pored pljeskavica = prepositional phrase describing location

Because pored takes the genitive case, and here pljeskavica is in the genitive plural.

The noun pljeskavica is feminine, and its forms are:

• nominative singular: pljeskavica
• genitive singular: pljeskavice
• nominative plural: pljeskavice
• genitive plural: pljeskavica

So after pored, you need the genitive:

• pored pljeskavice = next to the burger/patty (singular)
• pored pljeskavica = next to the burgers/patties (plural)

This sentence uses the plural.

Yes, in standard Serbian, pored is used with the genitive.

Examples:

• pored kuće = next to the house
• pored stola = next to the table
• pored pljeskavica = next to the burgers/pljeskavicas

This is something worth memorizing as a fixed pattern:

• pored + genitive

Because the genitive plural form of some feminine nouns can have no ending, so it may look identical to the nominative singular.

That is exactly what happens with pljeskavica:

• nominative singular: pljeskavica
• genitive plural: pljeskavica

So the form looks the same, but the grammar is different.
You know it is genitive plural here because:

• it follows pored, which requires genitive
• the meaning is plural in the sentence

This is very common in Serbian and can feel strange at first to English speakers.

Serbian normally does not use words like a or the.

So Ražnjići su pored pljeskavica could mean:

• The skewers are next to the burgers
• Skewers are next to burgers

Which one sounds best in English depends on context.

Serbian usually leaves definiteness to be understood from the situation rather than marking it with an article.

Yes. Serbian word order is fairly flexible, although some orders sound more neutral than others.

The basic neutral version here is:

• Ražnjići su pored pljeskavica.

You could also say:

• Pored pljeskavica su ražnjići.

That puts more focus on the location or on what is being contrasted.

One important point: su is a clitic, so it usually comes in the second position of the sentence or clause, not just anywhere. That is why:

• Pored pljeskavica su ražnjići is natural
• Pored pljeskavica ražnjići su is not the normal order

Here pored is a preposition meaning next to, beside, or alongside.

It introduces the noun phrase pljeskavica in the genitive.

So the structure is:

• pored + genitive noun

In other contexts, pored can also have extended meanings like besides or in addition to, but in this sentence it is clearly about physical location.

Then you would use the genitive singular after pored:

• Ražnjići su pored pljeskavice.

That means The skewers are next to the pljeskavica or next to the burger/patty.

So compare:

• pored pljeskavice = next to one pljeskavica
• pored pljeskavica = next to several pljeskavicas

A few Serbian sounds in this sentence may stand out:

• ž sounds like the s in measure
• nj sounds like the ny in canyon
• ć is a soft ch-like sound, softer than English ch
• lj in pljeskavica sounds like a soft ly sound

Very roughly:

• ražnjići ≈ RAZH-nyi-chee
• pljeskavica ≈ PLYES-ka-vee-tsa

These are only approximations, but they help at the start.

Not exactly.

• ražnjići refers to pieces of meat on skewers, often similar to kebabs or meat skewers
• pljeskavica is a Balkan meat patty, often translated loosely as burger, but it is a specific regional dish

So in learning materials, you may see simpler English translations, but the Serbian words refer to very specific foods.