
die Portion
portion
A specific amount of food intended for one person or served to one person.
Ich hätte gern eine große Portion Pommes frites.
I'd like a large portion of French fries.
portion
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portion
A specific amount of food intended for one person or served to one person.
Ich hätte gern eine große Portion Pommes frites.
I'd like a large portion of French fries.

portion
A certain share or amount of something that does not necessarily have to be food.
Für dieses Projekt braucht man eine extra Portion Geduld.
For this project, you need an extra portion of patience.
When 'Portion' (portion) is followed by a noun that describes the type of portion, this noun usually comes directly after it without a preposition. Using 'von' (of) is grammatically correct, but less common in everyday language.
Er bestellte eine Portion Nudeln mit Tomatensoße.
He ordered a portion of pasta with tomato sauce.
In connection with food, 'Portion' (portion) is often used with the adjectives 'groß' (large), 'klein' (small), or 'doppelt' (double). Typical verbs are 'bestellen' (to order), 'nehmen' (to take), or 'bekommen' (to get).
Eine kleine Portion Pommes, bitte!
A small portion of fries, please!
In the figurative meaning, 'Portion' (portion) is often combined with abstract nouns. Typical phrases are 'eine Portion Glück' (a portion of luck), 'eine Portion Mut' (a portion of courage), or 'eine extra Portion Geduld' (an extra portion of patience).
Mit einer ordentlichen Portion Selbstvertrauen schaffst du die Prüfung.
With a solid portion of self-confidence, you'll pass the exam.
piece
When serving food, Stück and Portion can refer to the same amount. Stück mainly refers to the specific, separated unit, while Portion emphasizes the amount intended for or served to one person. With cake, both are therefore possible, depending on whether the shape or the amount is important.

Die Bedienung gab jedem Gast eine Portion Kuchen auf den Teller.
The server put a portion of cake on each guest’s plate.
Die Bedienung legte jedem Gast ein Stück Kuchen auf den Teller.
The server put a piece of cake on each guest’s plate.