Bevor ich die Suppe umrühre, nehme ich den Kochlöffel aus der Schublade.

Because bevor introduces a subordinate clause. In German, the finite verb in a subordinate clause normally goes to the end.

So:

• Bevor ich die Suppe umrühre = Before I stir the soup

The normal main-clause pattern would be:

• Ich rühre die Suppe um.

But after bevor, the separable verb umrühren appears as one whole verb form at the end:

• ..., bevor ich die Suppe umrühre.

Because the sentence begins with the subordinate clause:

• Bevor ich die Suppe umrühre, ...

That entire clause takes the first position in the sentence. In a German main clause, the conjugated verb must come in second position. So after the opening clause, the verb comes immediately:

• Bevor ich die Suppe umrühre, nehme ich den Kochlöffel aus der Schublade.

This is a very common pattern:

• Wenn ich Zeit habe, gehe ich spazieren.
• Nachdem er gegessen hat, arbeitet er weiter.

Because umrühren is a separable verb.

In a normal main clause, separable verbs split:

• Ich rühre die Suppe um.

But in a subordinate clause, they usually do not split. The prefix stays attached to the verb:

• ..., bevor ich die Suppe umrühre.

So:

• main clause: Ich rühre ... um
• subordinate clause: ..., weil/bevor/dass ich ... umrühre

Die Suppe is in the accusative case because it is the direct object of umrühren.

You are stirring what?

• die Suppe

With a feminine noun like die Suppe, the article is the same in nominative and accusative singular:

• nominative: die Suppe
• accusative: die Suppe

So the form does not change here, even though the case is accusative.

Because den Kochlöffel is the direct object of nehmen, so it must be in the accusative case.

You take what?

• den Kochlöffel

Kochlöffel is masculine: der Kochlöffel

Masculine singular articles change in the accusative:

• nominative: der Kochlöffel
• accusative: den Kochlöffel

That is why the sentence uses den.

Because the preposition aus always takes the dative case.

So:

• aus + dative

Schublade is feminine:

• nominative: die Schublade
• dative: der Schublade

That gives:

• aus der Schublade = out of/from the drawer

Bevor means before as a conjunction introducing a clause.

• Bevor ich die Suppe umrühre, ...
• Before I stir the soup, ...

Vor is a preposition, not a conjunction. It is used with a noun or pronoun, not a full clause.

Compare:

• bevor ich die Suppe umrühre = before I stir the soup
• vor dem Umrühren = before the stirring / before stirring

So:

• bevor
  • clause
• vor
  • noun phrase

Yes. You can say:

• Ich nehme den Kochlöffel aus der Schublade, bevor ich die Suppe umrühre.

This means the same thing.

The difference is mostly about focus and style:

• Starting with Bevor... emphasizes the time relationship first.
• Starting with Ich nehme... emphasizes the action first.

Both are natural German.

Yes. In German, a subordinate clause is normally separated from the main clause by a comma.

So this comma is required:

• Bevor ich die Suppe umrühre, nehme ich den Kochlöffel aus der Schublade.

This is true whether the subordinate clause comes first or second:

• Bevor ich die Suppe umrühre, nehme ich den Kochlöffel aus der Schublade.
• Ich nehme den Kochlöffel aus der Schublade, bevor ich die Suppe umrühre.

German often uses the present tense to describe actions in the present or near future, especially when the sequence is clear from context.

Here:

• Bevor ich die Suppe umrühre, nehme ich den Kochlöffel aus der Schublade.

Both verbs are in the present tense, but the word bevor clearly shows which action happens first.

English does something similar:

• Before I stir the soup, I take the spoon out of the drawer.

So the tense is normal; the timing is carried by bevor.

Yes, there is a difference.

• rühren can mean to stir or to move/mix something
• umrühren usually means to stir around, to mix by stirring, or simply to stir in many cooking contexts

In kitchen language, umrühren is very common for stirring soup, sauce, batter, and so on.

So in this sentence, die Suppe umrühren is a very natural way to say stir the soup.

Because German very often makes compound nouns.

Here:

• Koch = cook / cooking
• Löffel = spoon

Together:

• Kochlöffel = cooking spoon / wooden spoon

The grammatical gender usually comes from the last part of the compound. Since Löffel is masculine (der Löffel), the whole word is also masculine:

• der Kochlöffel

Yes, but it would mean something slightly different depending on the sentence.

Your sentence says:

• Ich nehme den Kochlöffel aus der Schublade.
• I take the cooking spoon out of the drawer.

If you say mit dem Kochlöffel, that means with the cooking spoon and describes the tool used for an action:

• Ich rühre die Suppe mit dem Kochlöffel um.
• I stir the soup with the cooking spoon.

So:

• den Kochlöffel = the object you take
• mit dem Kochlöffel = the instrument you use

Yes, if that fits the situation.

• aus der Schublade = out of the drawer
• aus dem Schrank = out of the cupboard/cabinet

Notice the article changes because the noun changes gender:

• die Schublade → aus der Schublade
• der Schrank → aus dem Schrank

Both use dative because of aus.

If you turn each clause into an independent main clause, the word order changes.

Main-clause versions:

• Ich rühre die Suppe um.
• Ich nehme den Kochlöffel aus der Schublade.

So the subordinate clause:

• bevor ich die Suppe umrühre

comes from the main-clause structure:

• ich rühre die Suppe um

This is a useful comparison because it shows both key changes:

1. the verb moves to the end
2. the separable prefix joins the verb again