Mama alipaka mayonesi kidogo kwenye sandwichi, lakini mimi nilitaka siki zaidi kwenye kachumbari.

Alipaka means he/she spread or he/she applied.

It breaks down like this:

• a- = he/she
• -li- = past tense
• -paka = spread / smear / apply

So Mama alipaka... means Mother spread/applied...

In Swahili, the verb normally includes a subject marker, even when the full subject noun is also stated.

So in:

• Mama alipaka...

the word Mama names the subject, and a- inside alipaka also means she.

This is normal Swahili grammar, not repetition in the English sense.

Mayonesi kidogo means a little mayonnaise or a small amount of mayonnaise.

Here:

• mayonesi = mayonnaise
• kidogo = a little / small amount

So it is talking about quantity, not size.

In Swahili, words that describe or limit a noun often come after the noun.

So:

• mayonesi kidogo = a little mayonnaise
• siki zaidi = more vinegar

This is one of the most common word-order differences from English.

Kwenye is a very common locative word that can mean on, in, at, or to, depending on context.

In this sentence:

• kwenye sandwichi = on the sandwich
• kwenye kachumbari = in/on the kachumbari

With food, English often makes a sharper distinction between on and in than Swahili does. Kwenye is a natural general choice here.

Because both parts of the sentence mention where something is wanted or applied:

• mayonesi kidogo kwenye sandwichi = a little mayonnaise on the sandwich
• siki zaidi kwenye kachumbari = more vinegar in/on the kachumbari

Repeating kwenye is completely natural and helps keep both locations clear.

Mimi is not strictly necessary for basic grammar, because nilitaka already shows I:

• ni- = I
• -li- = past
• -taka = want

So nilitaka already means I wanted.

But adding mimi gives emphasis or contrast:

• lakini mimi nilitaka... = but I wanted...

It highlights the difference between what Mama did and what I wanted.

Nilitaka means I wanted.

It breaks down as:

• ni- = I
• -li- = past tense
• -taka = want

So:

• nilitaka siki zaidi = I wanted more vinegar

Zaidi means more.

So:

• siki zaidi = more vinegar

Like kidogo, it comes after the noun it modifies.

Compare:

• maji zaidi = more water
• chakula zaidi = more food
• sukari zaidi = more sugar

Swahili does not use articles like English a/an and the.

So a noun like:

• sandwichi

can mean a sandwich or the sandwich, depending on context.

The same is true for:

• kachumbari
• mayonesi
• siki

English needs articles, but Swahili usually does not.

They are common loanwords used in Swahili.

• mayonesi = mayonnaise
• sandwichi = sandwich
• siki = vinegar

Modern Swahili uses many borrowed words, especially for food, technology, and everyday objects. These words are fully normal in real usage.

Kachumbari is a common East African fresh salad or relish, often made with things like tomatoes, onions, and sometimes chili or other ingredients.

In this sentence:

• kwenye kachumbari = in/on the kachumbari

A learner may notice that this word does not look like a direct English equivalent, because it refers to a specific local dish rather than a general English category.

Yes. That would still be grammatical.

• Lakini nilitaka siki zaidi kwenye kachumbari.

This means essentially the same thing, but it sounds less contrastive.
With mimi, the speaker is stressing my preference more clearly.

The sentence mostly follows a straightforward pattern:

Subject + Verb + Object + Location

For example:

• Mama
  • alipaka
    • mayonesi kidogo
      • kwenye sandwichi
• mimi
  • nilitaka
    • siki zaidi
      • kwenye kachumbari

The connector lakini means but and joins the two clauses.

Sometimes yes, but the nuance changes a little.

• kwenye sandwichi = a natural general way to say on/in the sandwich
• juu ya sandwichi = more specifically on top of the sandwich

For food, kwenye is often the more natural everyday choice when talking about putting or spreading something onto it.