Post kiam ni vespermanĝis, ni manĝis malgrandan kukon kun teo.

Post kiam means after in the sense of after the time when or after introducing a whole clause.

• post = after
• kiam = when

So Post kiam ni vespermanĝis literally means After when we had dinner, but in natural English that is just After we had dinner.

Esperanto often uses post kiam when after is followed by a full clause with a verb. If you only have a noun phrase, you can use just post:

• post la vespermanĝo = after the dinner
• post kiam ni vespermanĝis = after we had dinner

Vespermanĝis is the past tense of vespermanĝi, which means to have dinner / to eat supper / to dine in the evening.

It is built from:

• vesper- = evening
• manĝi = to eat

So ni vespermanĝis means we had dinner or more literally we evening-ate.

This is a very normal Esperanto way to build vocabulary: combine a root with another element to make a more specific idea.

Esperanto often expresses ideas very regularly and transparently. Instead of needing a completely different verb like English dine or a phrase like have dinner, Esperanto can simply use vespermanĝi.

That makes the language very systematic:

• manĝi = eat
• matenmanĝi = eat breakfast / have breakfast
• tagmanĝi = eat lunch / have lunch
• vespermanĝi = eat dinner / have dinner

So this sentence uses a normal Esperanto pattern rather than an irregular idiom.

Because both actions happened in the past:

• vespermanĝis = had dinner
• manĝis = ate

Esperanto uses the same simple past ending -is for past actions. The sequence is understood from the words post kiam:

• first: ni vespermanĝis
• later: ni manĝis malgrandan kukon kun teo

English often uses had eaten in the earlier clause, but Esperanto usually does not need a special past perfect form here. The time relationship is clear from post kiam.

Because Esperanto usually does not mark the earlier past action with a special tense when the order is already obvious from context.

In this sentence, post kiam already tells you that the dinner happened before the cake-eating. So simple past is enough.

English often says:

• After we had dinner, we ate a small cake with tea.

Esperanto normally says:

• Post kiam ni vespermanĝis, ni manĝis...

A more complicated form is possible in Esperanto in some contexts, but it is usually unnecessary here.

Because each clause normally has its own subject stated clearly:

• Post kiam ni vespermanĝis
• ni manĝis malgrandan kukon kun teo

Even though the subject is the same in both clauses, repeating ni is natural and clear. Esperanto often keeps subjects explicit rather than leaving them implied.

Because malgrandan kukon is the direct object of manĝis.

In Esperanto, direct objects take -n:

• kuko = a cake
• kukon = a cake as direct object

Adjectives must agree with the noun they describe, so malgranda also gets -n:

• malgranda kuko = a small cake
• malgrandan kukon = a small cake as direct object

So:

• ni manĝis malgrandan kukon = we ate a small cake

Malgrandan comes from malgranda, meaning small.

It is formed from:

• granda = big, large
• mal- = opposite

So:

• granda = big
• malgranda = small

Then it becomes malgrandan because it agrees with kukon in case:

• both are singular
• both are in the accusative (-n)

Because in Esperanto, adjectives agree with the nouns they modify in both:

• number
• case

So if the noun is:

• plural, the adjective is plural too
• accusative, the adjective is accusative too

Here:

• kukon has -n because it is the direct object
• malgrandan also has -n to match kukon

This agreement is a basic rule of Esperanto grammar.

Kun teo means with tea.

Here it means the cake was eaten together with tea, or accompanied by tea. In natural English, you might say:

• we ate a small cake with tea
• we had a small cake with some tea

It does not mean that tea was used as a tool for eating the cake. It means tea was served along with it.

Not normally in this sentence. Kun usually means with, together with, or accompanied by.

So malgrandan kukon kun teo is most naturally understood as:

• a small cake, together with tea

If you wanted to say the cake was in tea or soaked in tea, you would use a different expression.

To an English speaker it may feel a little repetitive, but in Esperanto this is quite normal.

The first verb, vespermanĝis, means had dinner. The second, manĝis, means ate.

So they are related, but not identical in meaning:

• first: we had dinner
• then: we ate a small cake with tea

Esperanto often prefers clear, regular wording over avoiding repetition at all costs.

Yes, Esperanto word order is fairly flexible, though the original order is very natural.

For example, you could also say:

• Ni manĝis malgrandan kukon kun teo post kiam ni vespermanĝis.

That means the same thing.

The original version puts the time clause first, which is often a natural way to set the scene:

• After we had dinner, ...

Usually yes, or very close. Kuko generally means cake, but depending on context it can sometimes cover things that English might call a pastry or small cake.

In this sentence, malgrandan kukon is best understood as a small cake.

Yes. Since vespermanĝis means had dinner / had supper / dined, the exact English wording can vary depending on dialect and context.

Possible natural translations include:

• After we had dinner, we ate a small cake with tea.
• After supper, we ate a small cake with tea.
• After we dined, we ate a small cake with tea.

The Esperanto grammar stays the same even if English offers several natural translations.