Im Messbecher fehlt noch etwas Milch; dazu gebe ich einen halben Teelöffel Salz.

im is a contraction of in dem.

• in = in
• dem = the, in the dative case

So im Messbecher literally means in the measuring cup.

German very often contracts:

• in dem → im
• an dem → am
• zu dem → zum
• zu der → zur

Because this sentence describes a location, not movement.

German uses:

• in + dative for where something is
• in + accusative for where to something goes

Here, the milk is missing in the measuring cup, so it is a static location:

• im Messbecher = in the measuring cup

If you were talking about putting something into the cup, you would use the accusative:

• Ich gieße die Milch in den Messbecher. = I pour the milk into the measuring cup.

German often uses fehlen to express that something is missing or lacking.

So:

• Im Messbecher fehlt noch etwas Milch. literally: In the measuring cup, some milk is still missing.

This sounds natural in German when talking about an amount that has not yet been added.

You could say ist nicht da, but it would usually sound less natural in this kind of recipe or instruction context. fehlen is the normal verb when a needed amount is still absent.

Here noch means still.

So fehlt noch etwas Milch means:

• some milk is still missing
• in other words, the amount is not complete yet

In recipe language, noch often suggests that one more ingredient or a little more of something still needs to be added.

Compare:

• Es fehlt Milch. = Milk is missing.
• Es fehlt noch Milch. = Milk is still missing / we still need some milk.

Because Milch is usually treated as an uncountable mass noun, like milk in English.

So German normally says:

• etwas Milch = some milk
• viel Milch = a lot of milk
• wenig Milch = little milk

Using eine Milch would only make sense in special contexts, for example ordering a type or serving of milk, but not in a normal recipe sentence.

Yes. etwas here means some or a little.

In this sentence:

• etwas Milch = some milk / a little milk

It is a very common way to talk about an unspecified amount.

Compare:

• etwas Zucker = some sugar
• etwas Wasser = some water
• etwas Salz = some salt

dazu here means something like to that, with that, or in addition to that.

In this sentence it links the second clause to what is already in the measuring cup:

• dazu gebe ich ... = to that / along with that, I add ...

In cooking instructions, dazu is very common when adding something to an existing mixture.

For example:

• Ich gebe Zucker dazu. = I add sugar to it.
• Dazu kommt Mehl. = Then flour is added / Flour goes in as well.

Because German puts the finite verb in second position in a main clause.

If dazu is placed first for emphasis or linking, the verb must come next:

• Dazu gebe ich einen halben Teelöffel Salz.

Structure:

• Position 1: Dazu
• Position 2: gebe
• then the subject: ich

This is called inversion in many learner explanations.

You could also say:

• Ich gebe dazu einen halben Teelöffel Salz.

Both are correct, but starting with dazu makes the connection to the previous clause a bit stronger.

Because this phrase is in the accusative case, since it is the direct object of gebe.

The basic noun is:

• der Teelöffel = the teaspoon

In the accusative singular, der-words change like this:

• ein halber Teelöffel = nominative
• einen halben Teelöffel = accusative

So:

• Ich gebe einen halben Teelöffel Salz. = I add half a teaspoon of salt.

Both einen and halben show accusative masculine endings.

Because halb is behaving like an adjective before a masculine noun in the accusative with ein.

The pattern is:

• nominative masculine: ein halber Teelöffel
• accusative masculine: einen halben Teelöffel

So the -en ending appears because of:

1. masculine noun: Teelöffel
2. accusative case
3. adjective after an ein-word

This is standard German adjective ending behavior.

Because Salz here is being used in a measure expression:

• einen halben Teelöffel Salz = half a teaspoon of salt

German often leaves out the article after a unit of measure when talking about a substance:

• ein Glas Wasser = a glass of water
• eine Tasse Kaffee = a cup of coffee
• ein Kilo Mehl = a kilo of flour
• einen halben Teelöffel Salz = half a teaspoon of salt

This is very natural and common.

Yes. Very literally, it is one half teaspoon salt, but natural English adds of:

• half a teaspoon of salt

German often does not use a separate word corresponding to English of in this kind of measurement phrase.

So:

• ein Glas Wasser = a glass of water
• ein Stück Kuchen = a piece of cake
• ein Löffel Öl = a spoonful of oil

The semicolon links two closely related main clauses:

• Im Messbecher fehlt noch etwas Milch
• dazu gebe ich einen halben Teelöffel Salz

A semicolon is stronger than a comma and weaker than a full stop. It shows that the two ideas belong together very closely.

In everyday writing, many people would also use:

• a full stop: Im Messbecher fehlt noch etwas Milch. Dazu gebe ich ...
• sometimes a comma is seen, but a semicolon is more careful and correct for joining two independent clauses like this

Yes. There are several natural alternatives, for example:

• Im Messbecher fehlt noch etwas Milch. Dazu gebe ich einen halben Teelöffel Salz.
• Im Messbecher fehlt noch etwas Milch, und ich gebe dazu einen halben Teelöffel Salz.
• Es fehlt noch etwas Milch im Messbecher; dazu gebe ich einen halben Teelöffel Salz.

The original version sounds quite natural, especially in recipe or instruction style. It is compact and matter-of-fact.

Yes, several:

• der Messbecher = measuring cup / measuring jug
• fehlen = to be missing / to be lacking
• etwas = some / a little
• dazu = to that / in addition
• geben = to add / to put
• der Teelöffel = teaspoon
• das Salz = salt
• die Milch = milk

This sentence is a good example of common recipe German, especially:

• expressing that an ingredient is still missing
• adding something to a mixture
• using measurement phrases naturally