Riset koger i gryden, mens jeg skærer en agurk.

Ris is a neuter noun in Danish, and riset is its definite form: the rice.

A bare noun like ris often means rice in a general sense, while riset points to a specific portion of rice already understood from the situation, such as the rice that is currently cooking.

So in this sentence, riset koger is like saying the rice is boiling/cooking.

Also, even though rice consists of many grains, Danish normally treats ris as a singular mass noun, much like English rice.

Danish usually makes nouns definite by adding the article to the end of the noun.

• en gryde = a pot
• gryden = the pot

So i gryden means in the pot.

You can use den gryde, but that is normally for extra emphasis or when the noun has an adjective:

• den store gryde = the big pot

Without an adjective, the suffixed form is the normal one.

Because the sentence introduces it as a cucumber, not the cucumber.

• en agurk = a cucumber
• agurken = the cucumber

If the speaker and listener already knew which cucumber was meant, agurken would be possible. But here it sounds like the speaker is just cutting one cucumber, not a previously identified one.

Danish usually uses the present tense for both:

• general actions
• actions happening right now

So:

• Riset koger = the rice is boiling / the rice boils
• jeg skærer en agurk = I am cutting a cucumber / I cut a cucumber

In this context, the meaning is clearly ongoing because of mens and the situation described.

If Danish wants to be more explicit about an ongoing action, it can use expressions like er ved at, but that is not necessary here.

Mens means while.

It connects two actions that happen at the same time:

• Riset koger i gryden
• mens jeg skærer en agurk

So the sentence describes two simultaneous actions.

Mens introduces a subordinate clause, which matters for word order.

Because after mens, Danish uses subordinate clause word order.

In a subordinate clause, the subject usually comes before the verb:

• mens jeg skærer en agurk

That is different from main clauses, where Danish often follows the verb-second pattern.

For example:

• Jeg skærer en agurk.
• Nu skærer jeg en agurk.

But after mens, you keep the normal subordinate order:

• mens jeg skærer en agurk

It can cover both ideas, depending on context.

The verb at koge is connected with boiling and cooking by boiling. So:

• Vandet koger = The water is boiling
• Riset koger = The rice is boiling / cooking

In this sentence, English would often naturally say The rice is cooking in the pot, even though the Danish verb is still koger.

The infinitive is at skære, meaning to cut.

The present tense is formed as:

• at skære → skærer

This verb is common and useful. Some forms are:

• infinitive: at skære
• present: skærer
• past: skar
• past participle: skåret

So jeg skærer means I cut or I am cutting.

Because mens jeg skærer en agurk is a subordinate clause.

In Danish, commas are often used to mark the boundary before subordinate clauses. So the comma helps show the structure:

• main clause: Riset koger i gryden
• subordinate clause: mens jeg skærer en agurk

You may also see some variation in comma usage depending on the comma system being followed, but this comma is very normal and easy for learners to recognize.

Because they are showing different things:

• riset = definite neuter singular → the rice
• gryden = definite common-gender singular → the pot
• en agurk = indefinite common-gender singular → a cucumber

So the sentence mixes:

• things already specific in the situation: the rice, the pot
• something newly mentioned: a cucumber

That is very natural Danish.

Yes. You could say:

• Mens jeg skærer en agurk, koger riset i gryden.

That still means the same thing.

But notice the word order in the main clause after the subordinate clause. Danish keeps verb-second order in the main clause, so it becomes:

• ..., koger riset i gryden

not:

• ..., riset koger i gryden

So this is a useful contrast:

• Riset koger i gryden, mens jeg skærer en agurk.
• Mens jeg skærer en agurk, koger riset i gryden.

Sometimes, yes.

A common alternative is imens, which also means while. In many contexts, mens and imens are very close in meaning.

So you may hear:

• Riset koger i gryden, imens jeg skærer en agurk.

But mens is very common and completely natural here.