Eu corto o limão às rodelas para o chá.

Yes. In Portuguese, the subject pronoun is often left out because the verb ending already shows who the subject is. Corto already means I cut, so Corto o limão às rodelas para o chá is perfectly natural.

Including eu can add emphasis, contrast, or clarity. For example, Eu corto o limão, tu preparas o chá = I cut the lemon, you make the tea.

Corto is the 1st person singular present indicative of cortar = to cut.

So:

• eu corto = I cut
• tu cortas = you cut
• ele/ela corta = he/she cuts

In this sentence, it can mean a habitual action (I cut the lemon into slices for tea) or something happening now, depending on context.

Portuguese often uses the definite article where English might not. O limão means the lemon.

Here, o limão sounds natural because it refers to the lemon being used in that situation. Saying just corto limão would usually sound unnatural in normal speech.

So Portuguese often prefers:

• o limão
• o chá rather than leaving the article out.

Às rodelas means into slices or more literally in round slices.

A rodela is a round slice, like a slice of lemon, onion, or cucumber. So cortar às rodelas means to cut something into circular pieces.

It is a very common expression with food.

Às is a contraction of:

• a
  • as

The grave accent marks this contraction.

In expressions like às rodelas, Portuguese uses this fixed structure. Since rodelas is feminine plural, the form is às.

This is not the same as an acute accent like in chá. The grave accent in às shows contraction, not a different stressed vowel.

Because when you cut a lemon this way, you normally get several slices, not just one. So Portuguese uses the plural: às rodelas.

The singular à rodela would sound unusual here. The fixed idiomatic expression is normally plural.

Yes. Em rodelas is also very common and natural.

So both of these work:

• Corto o limão às rodelas
• Corto o limão em rodelas

They are very close in meaning. For a learner, it is useful to recognize both. In everyday usage, you will hear both forms.

It means for the tea or for use in the tea.

Here, para expresses purpose: the lemon is being cut in order to be used with the tea.

So the idea is:

• I slice the lemon for the tea
• I slice the lemon to put in the tea

It does not necessarily mean the lemon is already in the tea, only that this is the purpose.

Again, Portuguese often uses the article more than English does. O chá literally means the tea, but in English we might simply say for tea or for the tea depending on context.

In Portuguese, para o chá sounds natural and idiomatic. Leaving out the article would usually not sound as good in a normal sentence.

It can be either. The Portuguese present tense often covers both ideas, just like in many everyday English situations.

Depending on context, Eu corto o limão às rodelas para o chá can mean:

• I cut the lemon into slices for tea (habit / usual action)
• I’m cutting the lemon into slices for the tea (right now)

Context tells you which meaning is intended.

Yes, it is natural. The order is straightforward:

• Eu corto = subject + verb
• o limão = direct object
• às rodelas = how it is cut
• para o chá = purpose

A very natural version in Portuguese from Portugal would also be: Corto o limão às rodelas para o chá, without eu.

So the sentence is grammatically correct and idiomatic.