Aggiungo i piselli alla zuppa di verdure.

In Italian, the subject pronoun is often omitted because the verb ending already shows who is doing the action.

• aggiungo = I add
• The -o ending tells you it is I

So:

• Aggiungo i piselli... = I add the peas...

You can say Io aggiungo i piselli..., but io is usually only added for emphasis or contrast, such as:

• Io aggiungo i piselli, tu aggiungi le carote.
  I add the peas, you add the carrots.

Aggiungo comes from the infinitive aggiungere, meaning to add.

This is the 1st person singular present tense form:

• aggiungere = to add
• aggiungo = I add / I am adding

Some present-tense forms of aggiungere are:

• aggiungo = I add
• aggiungi = you add
• aggiunge = he/she adds
• aggiungiamo = we add
• aggiungete = you all add
• aggiungono = they add

Notice that it is not formed as aggiugere or aggiungiere—the base verb is aggiungere.

Because piselli is a plural masculine noun, and in Italian plural count nouns usually take an article when you are talking about a specific item or ingredient in context.

• il pisello = the pea
• i piselli = the peas

So:

• Aggiungo i piselli... = I add the peas...

In English, we often leave out the in cooking instructions, but Italian commonly keeps the article.

Compare:

• Taglio le carote. = I cut the carrots.
• Aggiungo il sale. = I add the salt.
• Metto i pomodori nella pentola. = I put the tomatoes in the pot.

Alla is a contraction of:

• a = to
• la = the

So:

• alla zuppa = to the soup

Italian often combines a preposition and an article into one word:

• a + il = al
• a + lo = allo
• a + la = alla
• a + i = ai
• a + gli = agli
• a + le = alle

Since zuppa is feminine singular, it takes la, so:

• a + la zuppa → alla zuppa

Actually, this matches English quite closely.

In Italian, aggiungere qualcosa a qualcosa means to add something to something.

So the structure is:

• aggiungere
  • thing being added + a
    • destination

In this sentence:

• i piselli = the thing being added
• alla zuppa di verdure = to the vegetable soup

This is a very common pattern:

• Aggiungo zucchero al caffè. = I add sugar to the coffee.
• Aggiunge sale alla pasta. = He/She adds salt to the pasta.

Di is often used to describe what something is made of or what type it is.

• zuppa di verdure = vegetable soup
• literally: soup of vegetables

This is the normal Italian way to express this idea.

You often use di without an article in these descriptive combinations:

• insalata di pomodori = tomato salad
• succo di frutta = fruit juice
• brodo di carne = meat broth

Zuppa delle verdure would sound different and more specific, more like the soup of the vegetables, which is not the usual way to say vegetable soup.

In Italian, the simple present often covers both meanings:

• I add
• I am adding

So Aggiungo i piselli alla zuppa di verdure can mean either:

• I add the peas to the vegetable soup
• I am adding the peas to the vegetable soup

If you really want to emphasize an action in progress, Italian can also use stare + gerundio:

• Sto aggiungendo i piselli alla zuppa di verdure. = I am adding the peas to the vegetable soup.

But in many everyday situations, the simple present is enough.

The basic order is:

• Aggiungo = verb
• i piselli = direct object
• alla zuppa di verdure = prepositional phrase

So the structure is:

Verb + thing added + destination

This is very natural in Italian.

Italian word order is somewhat flexible, but this version is the most neutral. You might also hear:

• Alla zuppa di verdure aggiungo i piselli.

This puts more focus on alla zuppa di verdure.

But for a standard statement, Aggiungo i piselli alla zuppa di verdure is perfect.

Yes, piselli is masculine plural.

The singular is:

• pisello = pea

Since many Italian nouns ending in -o are masculine, their plural is usually -i:

• pisello → piselli
• pomodoro → pomodori
• carciofo → carciofi

And the article changes too:

• il pisello = the pea
• i piselli = the peas

So i tells you it is masculine plural.

Sometimes learners think of in the soup, but with the verb aggiungere, Italian normally uses a:

• aggiungere qualcosa a qualcosa

So the standard sentence is:

• Aggiungo i piselli alla zuppa di verdure.

You might use in with other verbs, for example:

• Metto i piselli nella zuppa. = I put the peas in the soup.

So:

• aggiungere usually goes with a
• mettere often goes with in

Both can translate naturally into English, but the Italian verb affects the preposition.

A rough pronunciation guide is:

• aggiungo ≈ ad-JOON-go

A few useful points:

• gg is a strong consonant sound, like in j of jam, but held a little longer.
• giu sounds like joo
• stress is on giùn: ag-GIUN-go

Similarly:

• aggiungere ≈ ad-JOON-jeh-re

If you want to sound more natural, pay attention to the doubled consonant in aggi-.

Yes, absolutely. It sounds like a natural cooking sentence.

In recipes, Italian often uses several styles:

1. Present tense

   • Aggiungo i piselli alla zuppa di verdure.
     I add the peas to the vegetable soup.

2. Imperative

   • Aggiungi i piselli alla zuppa di verdure.
     Add the peas to the vegetable soup.

3. Infinitive in written instructions

   • Aggiungere i piselli alla zuppa di verdure.
     Add the peas to the vegetable soup.

So your sentence is perfectly normal, especially in spoken explanation or a first-person narration of what someone is cooking.

In context, i piselli often refers to the peas being used in the recipe, so it feels natural and specific.

Italian uses articles more often than English, especially with ingredients and everyday objects. So even when English might just say peas, Italian often says i piselli.

For example:

• Compro le mele. = I buy apples.
• Lavo i pomodori. = I wash the tomatoes.
• Aggiungo i piselli. = I add the peas.

So yes, it can refer to the peas involved in the situation, not necessarily a very narrowly defined set of peas already mentioned earlier.