Il cavolfiore cuoce più in fretta se lo taglio bene, mentre le ciliegie spariscono dal tavolo in pochi minuti.

In Italian, the definite article is often used where English would use no article at all.

So:

• il cavolfiore = cauliflower
• le ciliegie = cherries

This can refer to:

• a specific cauliflower / specific cherries in the situation, or
• the food item in a general sense

Italian does this much more than English. So Il cavolfiore cuoce... sounds natural, even though English would often just say Cauliflower cooks...

Because cuocere means to cook in the sense of to be cooking / to get cooked / to cook through, while cucinare usually means to cook/prep food as an action done by a person.

Here:

• Il cavolfiore cuoce = The cauliflower cooks / cooks through
• Io cucino il cavolfiore = I cook the cauliflower

So cuoce is the right choice because the cauliflower is the thing undergoing the cooking.

Più in fretta means faster or more quickly.

It is built like this:

• in fretta = quickly / in a hurry
• più in fretta = more quickly / faster

Italian often uses expressions like this instead of a single adverb.

You could also say:

• più velocemente

But più in fretta is very common and natural in everyday Italian.

Lo is a direct object pronoun meaning it.

It refers back to il cavolfiore.

So:

• taglio il cavolfiore = I cut the cauliflower
• lo taglio = I cut it

In the sentence:

• se lo taglio bene = if I cut it properly/well

Italian uses object pronouns before the conjugated verb, so lo taglio, not taglio lo.

In Italian, unstressed object pronouns like lo, la, li, le, mi, ti, ci, vi usually go before a conjugated verb.

So:

• lo taglio
• la mangio
• li vedo

This is normal Italian word order.

With infinitives, pronouns can attach to the end:

• tagliarlo = to cut it

But with a normal conjugated verb like taglio, the pronoun comes before it.

Italian often uses the present tense to express general truths, habits, or repeated situations.

So:

• Il cavolfiore cuoce più in fretta se lo taglio bene
  = Cauliflower cooks faster if I cut it well

This does not necessarily mean one single specific moment. It can mean whenever I do this, this is what happens.

English can do the same thing:

• If I cut it well, it cooks faster.

Because Italian usually omits subject pronouns when the verb ending already shows who the subject is.

• taglio clearly means I cut
• tagli would mean you cut
• taglia would mean he/she cuts

So io is unnecessary unless you want emphasis:

• se io lo taglio bene = if I cut it properly
  This sounds more emphatic, as if contrasting with someone else.

Normally, just se lo taglio bene is best.

Literally, bene means well.

In this context, it suggests properly, carefully, or in a good way. With food preparation, that can imply cutting it into suitable or small enough pieces so it cooks more quickly.

So se lo taglio bene can be understood as:

• if I cut it properly
• if I cut it well
• possibly if I cut it up nicely/finely enough

The exact nuance depends on context, but grammatically it is simply well.

Mentre means while, but it can also mean whereas when it introduces a contrast.

In this sentence, it does both things at once:

• it links the two parts of the sentence
• it creates a contrast between them

So here it is close to:

• while
• whereas

The sentence compares two situations:

• cauliflower takes some preparation to cook faster
• cherries vanish from the table very quickly

Not necessarily literally. Sparire means to disappear, but it is often used figuratively.

So:

• le ciliegie spariscono dal tavolo
  literally = the cherries disappear from the table natural meaning = people eat them very quickly

This is a very natural, idiomatic way to talk about food that gets eaten fast.

Dal = da + il = from the

So:

• dal tavolo = from the table

With sparire, Italian normally uses a preposition to say where something disappears from.

Examples:

• sparire dal tavolo = disappear from the table
• sparire dalla cucina = disappear from the kitchen

So dal is required here.

In pochi minuti means in a few minutes.

Here in is used to express the time within which something happens or is completed.

So:

• spariscono in pochi minuti = they disappear in a few minutes

This is different from per pochi minuti, which would mean for a few minutes.

A useful contrast:

• in due minuti = within two minutes
• per due minuti = for two minutes

So in is the correct choice because the cherries are gone after that short amount of time.

Because le ciliegie is plural, the verb must agree with it.

• la ciliegia sparisce = the cherry disappears
• le ciliegie spariscono = the cherries disappear

Italian verbs change depending on the subject, so this is simply normal subject-verb agreement.

Yes. Italian present tense is often used for:

• general truths
• habitual actions
• typical situations
• vivid statements

So the sentence is not limited to one exact moment. It describes what generally happens:

• cauliflower cooks faster if cut well
• cherries disappear from the table quickly

This is very common in both Italian and English.

Yes, that is grammatically possible.

Compare:

• se lo taglio bene = if I cut it well
• se taglio bene il cavolfiore = if I cut the cauliflower well

The version with lo sounds smoother once il cavolfiore has already been mentioned. Italian often avoids repeating the noun when a pronoun can replace it.

So in this sentence, se lo taglio bene is more natural.

The comma separates the two clauses and helps show the contrast.

The two parts are:

• Il cavolfiore cuoce più in fretta se lo taglio bene
• mentre le ciliegie spariscono dal tavolo in pochi minuti

Since mentre here introduces a contrasting second idea, the comma is natural and helpful. It is similar to how English often uses a comma before while or whereas in longer sentences.