Grøden er for varm, så min søster blander lidt mos i den og venter lidt.

Grøden is the definite form, meaning the porridge.

In Danish, the definite article is usually attached to the end of the noun:

• en grød = a porridge
• grøden = the porridge

So grøden er for varm means the porridge is too hot.

Yes. In Danish, for before an adjective often means too in the sense of excessively.

So:

• varm = hot/warm
• for varm = too hot

This is a very common pattern:

• for kold = too cold
• for dyr = too expensive
• for stor = too big

So here Grøden er for varm means the porridge is hotter than is convenient or desirable.

Because så here means so, linking two clauses:

• Grøden er for varm
• så min søster blander lidt mos i den og venter lidt

Danish punctuation often separates clauses clearly, and a comma before så is normal here.

Also, this så is a coordinating conjunction, not the adverb meaning then or thus.

Because så here is acting as a coordinating conjunction meaning so.

After a coordinating conjunction, Danish usually keeps normal main-clause word order:

• min søster blander...

If the sentence had begun with an adverb like derfor (therefore), inversion would be expected:

• Grøden er for varm. Derfor blander min søster...

So:

• så min søster blander... = normal after conjunction så
• derfor blander min søster... = inversion after fronted adverb

This is a very useful distinction for learners.

Because Danish does not combine a possessive like min with the suffixed definite article.

So you say:

• min søster = my sister

Not:

• min søsteren

This is similar to how English does not say my the sister.

Compare:

• søster = sister
• søsteren = the sister
• min søster = my sister

Because mos is being treated as a mass noun, and lidt works naturally with mass nouns to mean a little.

So:

• lidt mos = a little mash / a little purée

This is similar to:

• lidt vand = a little water
• lidt mælk = a little milk
• lidt sukker = a little sugar

You do not need en here, because mos is not being counted as one individual item.

Lidt means a little or a bit, but its role depends on what it modifies.

In this sentence it appears twice:

• lidt mos = a little mash/purée
  Here lidt is a quantifier modifying the noun mos.

• venter lidt = waits a little / waits a bit
  Here lidt is functioning more like an adverb, describing the action.

So the same word can be used with both nouns and verbs.

Den refers back to grøden.

Since grød is a common-gender noun, the pronoun used for it is den:

• grøden → den

So:

• blander lidt mos i den = mixes a little mash/purée into it

If the noun were neuter, Danish would use det instead.

Because Danish commonly says blande noget i noget for mix something into something or mix something in.

So:

• blande lidt mos i den = mix a little mash into it

You may also see related patterns like:

• blande sukker i kaffen = mix sugar into the coffee
• blande noget sammen = mix something together

The exact preposition depends on the construction, but i is very natural here.

It means waits a little / waits a bit / waits for a short time.

In natural English, you would often translate it more idiomatically as:

• waits a bit
• waits a little while

So lidt here refers to a short duration, even though Danish does not need an extra word like while.

Yes. Varm covers a range that can correspond to both warm and hot in English, depending on context.

In this sentence, because of for varm, the natural English meaning is probably too hot, not merely too warm.

So context determines the best translation.

The letter ø is one of the sounds English speakers often need to practice.

Very roughly:

• ø is a rounded front vowel
• it has no exact English equivalent

In these words:

• grøden
• søster

your lips should be rounded, but the tongue is placed more forward than for many English o sounds.

A few learner tips:

• Do not pronounce ø like ordinary English o
• Do not turn it into u
• Listen carefully to native audio and imitate the mouth shape

Also, d in grøden is usually softer than an English d between vowels, so the word may sound less sharply pronounced than an English speaker expects.

It is one sentence made up of two coordinated main clauses:

1. Grøden er for varm
2. så min søster blander lidt mos i den og venter lidt

The finite verbs are:

• er
• blander
• venter

In the second clause, blander and venter share the same subject, min søster.

So the structure is:

• The porridge is too hot,
• so my sister mixes ... and waits ...

This kind of clause chaining is very common and natural in Danish.