Se il cavolfiore è già cotto, posso gratinarlo con un po’ di formaggio.

Yes. Se means if and introduces a condition:

• Se il cavolfiore è già cotto = If the cauliflower is already cooked

In Italian, se is the normal word for real conditions like this. It is used very much like English if.

Italian often uses the definite article more than English does. Il cavolfiore literally means the cauliflower.

In a cooking context, this can refer to:

• the specific cauliflower you are talking about
• cauliflower as the ingredient currently being prepared

English sometimes drops the article in recipe-style language, but Italian often keeps it.

So:

• il cavolfiore = the cauliflower
• just cavolfiore is possible in some contexts, but here il cavolfiore sounds natural and specific

Because cotto here is functioning like an adjective meaning cooked, not like part of a completed action with ha.

So:

• è cotto = it is cooked
• è già cotto = it is already cooked

This describes the state of the cauliflower.

Compare:

• Il cavolfiore è cotto. = The cauliflower is cooked.
• Ho cotto il cavolfiore. = I cooked the cauliflower.

In the second sentence, cotto is part of the past tense with avere. In your sentence, it describes a condition or result.

Because cavolfiore is a masculine singular noun in Italian.

So the adjective must agree with it:

• il cavolfiore → masculine singular
• cotto → masculine singular form

Agreement examples:

• il cavolfiore è cotto
• la verdura è cotta
• i cavolfiori sono cotti
• le patate sono cotte

Già means already.

Here:

• è già cotto = is already cooked

Its position is very natural in Italian: it often comes before the adjective or past participle it modifies.

Other examples:

• È già pronto. = It’s already ready.
• Ho già mangiato. = I have already eaten.

So già works a lot like English already, though word placement is not always identical.

Gratinarlo is made of two parts:

• gratinare = to gratin, to brown in the oven with a topping
• lo = it (direct object pronoun)

So:

• gratinarlo = to gratin it / to brown it with a crust or topping

In cooking, gratinare usually means putting something in the oven so that the top becomes golden, often with cheese, breadcrumbs, butter, or similar ingredients.

Because in Italian, object pronouns are often attached to the infinitive.

So:

• gratinare + lo → gratinarlo

This means to gratin it.

Italian allows two patterns when there is a modal verb like potere:

• Posso gratinarlo
• Lo posso gratinare

Both mean I can gratin it.

The version with the pronoun attached to the infinitive is very common and natural.

Lo refers to il cavolfiore.

Since cavolfiore is masculine singular, the direct object pronoun is lo.

So:

• il cavolfiore → lo
• gratinarlo = to gratin the cauliflower / to gratin it

If the noun were feminine singular, you would use la instead:

• la zucchina → gratinarla

Posso is the first-person singular present of potere = can / to be able to.

Here it means:

• I can gratin it

Italian commonly uses the present tense in practical statements like this, especially in cooking or everyday instructions:

• Se è pronto, posso servirlo. = If it’s ready, I can serve it.

English might sometimes choose could in a softer tone, but posso here is straightforward and natural.

Un po’ di means a little bit of or some.

So:

• un po’ di formaggio = a little cheese / a bit of cheese

The di is required after un po’ when introducing the thing you mean:

• un po’ di pane = a little bread
• un po’ d’acqua = a little water
• un po’ di formaggio = a little cheese

Note that po’ is a shortened form of poco, and it is written with an apostrophe:

• po’, not po

Because after un po’ di, the noun normally appears without an article.

So:

• un po’ di formaggio = a little cheese
• not un po’ di il formaggio

This is similar to English, where we also say a little cheese, not a little the cheese.

Yes. Both are correct:

• Posso gratinarlo
• Lo posso gratinare

Both mean I can gratin it.

The first one is often slightly more compact and common in everyday speech. The second may place a little more focus on lo (it).

So learners should recognize both patterns:

• pronoun attached to the infinitive
• pronoun placed before the conjugated modal verb

It is common enough, especially in cooking contexts, but it is more specific than very basic verbs like cuocere or mettere in forno.

It refers specifically to giving food a browned, often crispy top in the oven.

In recipes or food discussions, it is perfectly natural:

• gratinare le patate
• gratinare la pasta
• gratinare il cavolfiore

So even if it is not one of the very first verbs learners meet, it is a useful kitchen verb.