
gekocht
cooked
Made ready to eat by heating in boiling water or another liquid.
Zum Abendessen gibt es gekochte Eier und Spinat.
For dinner there are cooked eggs and spinach.
cooked
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cooked
Made ready to eat by heating in boiling water or another liquid.
Zum Abendessen gibt es gekochte Eier und Spinat.
For dinner there are cooked eggs and spinach.

to be boiling
A colloquial expression for being very angry or inwardly upset.
Nach dieser unfairen Unterstellung war er innerlich förmlich gekocht.
After that unfair insinuation, he was practically boiling inside.
'Gekocht' (cooked) is the past participle of the verb 'kochen' (to cook/boil). It can stand before a noun like a normal adjective or be used with the verb 'sein' (to be).
Ich esse gern gekochtes Gemüse.
I like eating cooked vegetables.
You can recognize the meaning from the subject. If 'gekocht' (cooked) refers to food, the literal meaning is intended. If it refers to a person and their emotional state, it means 'very angry.'
Der Fisch ist perfekt gekocht.
The fish is perfectly cooked.
In the literal meaning, 'gekocht' (cooked) is often combined with foods that are typically prepared in water. These include 'gekochte Eier' (boiled eggs), 'gekochte Kartoffeln' (boiled potatoes), or 'gekochter Schinken' (cooked ham).
Zum Frühstück esse ich am liebsten ein weich gekochtes Ei.
For breakfast, I like a soft-boiled egg best.
The meaning 'angry' is colloquial. It is almost always used in the form 'jemand ist gekocht' (someone is boiling/very angry). The anger is often intensified by adverbs such as 'innerlich' (inside/inwardly) or 'richtig' (really).
Als er die Nachricht hörte, war er innerlich gekocht.
When he heard the news, he was boiling inside.
at all / done
When describing food, gar refers to the state it has reached: it is no longer raw and may also have been fried or roasted. Gekocht, by contrast, describes preparation by heating in water or another liquid. Food that has been gekocht is normally gar afterward.

Die Kartoffeln wurden zwanzig Minuten in Salzwasser gekocht.
The potatoes were boiled in salted water for twenty minutes.
Die Kartoffeln sind nach zwanzig Minuten gar.
The potatoes are done after twenty minutes.