De postre, mi abuela prepara natillas de vainilla.

De postre means for dessert or as dessert.

In this sentence, it tells you what role the dish has in the meal:

• De postre, mi abuela prepara natillas de vainilla.
• For dessert, my grandmother makes vanilla custard.

It is a very natural Spanish way to introduce the dessert course. You could also hear:

• Como postre... = As dessert...

But de postre is extremely common and idiomatic.

The comma is there because de postre has been moved to the front of the sentence for emphasis or topic-setting.

The more neutral order would be:

• Mi abuela prepara natillas de vainilla de postre.

But Spanish often brings this kind of phrase to the front:

• De postre, mi abuela prepara natillas de vainilla.

The comma helps separate that introductory phrase from the main clause. In informal writing, some people might omit it, but using the comma is very normal.

In modern Spanish, you normally use a possessive like mi without an article:

• mi abuela = my grandmother
• tu casa = your house

So:

• mi abuela prepara... = my grandmother makes...

Using la mi abuela is not standard modern Spanish in this context.

Here prepara comes from preparar, which literally means to prepare, but in many food contexts English would often translate it as makes.

So:

• mi abuela prepara natillas de vainilla can mean
• my grandmother makes vanilla custard or
• my grandmother prepares vanilla custard

Both are correct, but makes often sounds more natural in English for homemade food.

Prepara is the third-person singular present form of preparar.

It matches mi abuela:

• yo preparo
• tú preparas
• él / ella prepara

In this sentence, the present tense most likely expresses a habitual action:

• My grandmother makes vanilla custard for dessert.

It does not necessarily mean she is making it right now. If you wanted is preparing right now, Spanish would usually say:

• Mi abuela está preparando natillas de vainilla.

Natillas are a traditional Spanish dessert, similar to custard.

A few useful points:

• The word is usually used in the plural: natillas
• In Spain, it often refers to a homemade custard dessert, sometimes flavored with vanilla, cinnamon, or lemon
• You may see it served in individual portions

So although English often uses the uncountable noun custard, Spanish commonly uses natillas as a plural noun for the dessert itself.

This is just one of those vocabulary differences between the two languages.

In Spanish, the dessert is commonly called natillas in the plural, even when talking about one dessert dish in a general sense. English does not match this exactly, because custard is often uncountable.

So the translation is based on meaning, not on word-for-word number:

• natillas → custard

If you were talking about separate servings, context would decide how to translate it.

De vainilla means of vanilla or, more naturally in English, vanilla.

Spanish often uses de + noun to describe:

• flavor
• material
• type

So:

• helado de chocolate = chocolate ice cream
• tarta de queso = cheesecake
• natillas de vainilla = vanilla custard

This is very common and natural in Spanish.

In natillas de vainilla, vainilla is a noun, not an adjective.

Spanish often uses the pattern:

• noun + de + noun

So instead of something like vanilla custard with vanilla functioning adjectivally in English, Spanish says:

• custard of vanilla
• natillas de vainilla

That is why there is no adjective agreement here. Vainilla stays the same.

Yes. Spanish word order is flexible.

These are all possible:

• De postre, mi abuela prepara natillas de vainilla.
• Mi abuela prepara natillas de vainilla de postre.
• Mi abuela, de postre, prepara natillas de vainilla.

The first one sounds very natural if you want to highlight the dessert course first. Spanish often moves elements around more freely than English, as long as the meaning stays clear.

In this kind of sentence, de postre is usually more idiomatic.

Compare:

• De postre, mi abuela prepara natillas de vainilla.
  = For dessert / As dessert, my grandmother makes vanilla custard.

• Para el postre can also be understood, but it often sounds more like for the dessert course in a more literal or planned sense.

So if you are simply saying what is served as dessert, de postre is the most natural choice.

A broad pronunciation guide would be:

de pos-tre, mi a-BWE-la pre-PA-ra na-TI-lyas de bai-NI-lya

A few key points for Spain Spanish:

• abuela stress is on bue: a-BUE-la
• prepara stress is on pa: pre-PA-ra
• natillas stress is on ti: na-TI-llas
• In most of Spain, ll is pronounced like y in English, so natillas and vainilla sound roughly like na-TEE-yas and bai-NEE-ya
• In many parts of Spain, v and b sound very similar

Yes, it sounds natural.

It is a perfectly normal sentence, especially in contexts like:

• describing family routines
• talking about meals
• giving an example in a textbook
• describing what someone usually cooks

It has a slightly neat, descriptive feel because of the fronted de postre, but it is still very natural Spanish.