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.

'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
'gar' and 'gekocht' can both mean, for food, that something is no longer raw. 'gar' describes the state: the food is done and can be eaten. 'gekocht' mainly describes the method of preparation: something was heated in water or another liquid. So vegetables can be 'gekocht' and 'gar'. But a piece of meat from the pan can be 'gar' without being 'gekocht'. Learners easily confuse the words because the result can seem similar. The important point is: 'gar' says whether it is done; 'gekocht' says how it was prepared.

Zum Abendessen gab es gekochte Kartoffeln mit Quark.
For dinner there were boiled potatoes with quark.
Nach zwanzig Minuten war der Reis endlich gar.
After twenty minutes, the rice was finally done.