Marie garnit la tarte avec des framboises et des amandes.

Garnit is the conjugated form of the verb garnir.

• garnir = to garnish / to top / to fill
• Marie garnit = Marie garnishes / tops / fills

Because the subject is Marie (third person singular), the present-tense form is garnit.

A quick present-tense pattern:

• je garnis
• tu garnis
• il/elle/on garnit
• nous garnissons
• vous garnissez
• ils/elles garnissent

In this sentence, garnir means something like:

• to garnish
• to top
• to cover with ingredients
• sometimes to fill

With food, it often means adding ingredients onto or into something. So for une tarte, garnir suggests putting the raspberries and almonds on the tart as part of its preparation.

It is broader than just English garnish, which can sometimes sound decorative. In French, garnir can be a normal cooking verb.

La is the definite article, meaning the.
Une is the indefinite article, meaning a / an.

So:

• la tarte = the tart
• une tarte = a tart

French often uses the definite article when talking about a specific thing already known from context. This sentence is talking about the tart, not just any tart.

Des is the plural indefinite/partitive article here. It often means:

• some
• or just plural nouns in a general sense

So:

• des framboises = some raspberries
• des amandes = some almonds

In French, you usually cannot just say the bare noun by itself the way English often does. English can say with raspberries and almonds, but French normally needs an article:

• avec des framboises et des amandes

Avec means with.

It introduces the ingredients Marie is using to garnish the tart:

• avec des framboises = with raspberries
• avec des amandes = with almonds

This is the most natural preposition here.

In this sentence, both nouns keep their own article:

• des framboises et des amandes

That is the normal and clear structure. French usually repeats the article before each noun when they are separate items.

You may sometimes see article omission in certain fixed or literary styles, but for learners, the safe rule is:

• repeat the article with each plural noun

So this sentence is perfectly standard.

They are plural because the sentence refers to more than one raspberry and more than one almond, or at least to those ingredients in a general plural sense.

• une framboise = one raspberry

• des framboises = raspberries / some raspberries

• une amande = one almond
• des amandes = almonds / some almonds

In cooking, ingredients are often expressed this way.

Because the verb agrees with the subject, not with the objects.

The subject is Marie, which is third person singular.
So the verb is garnit.

The things being added to the tart — des framboises et des amandes — are not the subject. They do not control the verb form.

It is the present tense.

So the sentence means something like:

• Marie garnishes the tart with raspberries and almonds
• or, depending on context, Marie is topping the tart with raspberries and almonds

French present tense often covers both the English simple present and sometimes the present progressive idea.

The sentence follows a very common French pattern:

Subject + Verb + Object + Prepositional phrase

So here:

• Marie = subject
• garnit = verb
• la tarte = direct object
• avec des framboises et des amandes = prepositional phrase

English uses essentially the same order here:

• Marie garnishes the tart with raspberries and almonds

So the structure is quite straightforward.

A simple approximate pronunciation is:

ma-REE gar-NEE la tart a-VEK day fram-BWAZ ay day za-MAHND

A few useful notes:

• Marie → the stress is not as strong as in English, but the last syllable is clear.
• garnit → the final t is usually silent.
• tarte → the final e is silent.
• avec → usually pronounced a-vek
• framboises → sounds roughly like fram-bwaz
• amandes → sounds roughly like a-mand, with a nasal vowel in standard French

Also, in careful speech, des amandes often has a liaison:

• des amandes → day za-mand

Here Marie is a person’s name, so it normally appears without an article.

• Marie garnit la tarte.

In standard French, personal names usually do not take le / la / un / une.

Sometimes, yes — but it depends on context.

Garnir can mean:

• to garnish
• to top
• to decorate with
• to fill

For a tart, English might translate it in different ways depending on the recipe:

• Marie tops the tart with raspberries and almonds
• Marie garnishes the tart with raspberries and almonds
• sometimes Marie fills the tart..., if the ingredients are part of the filling

So the best English word depends on what exactly is happening in the recipe.

Yes. Et means and, so the sentence clearly says she uses both ingredients:

• des framboises et des amandes = raspberries and almonds

If French wanted to express a choice between them, it would use ou:

• des framboises ou des amandes = raspberries or almonds