When to use portion in Korean
Korean: 부분[ bu-bun ]

When to use it
"Portion" means one part of something. With food, 부분 can mean a specific part of the food, like the cheese part of a pizza, or one section of a meal. Use it when you talk about which part you like, eat first, or share with someone.
Example sentences
저는 피자의 치즈 부분을 좋아해요.
I like the cheese part of pizza.
도시락의 과일 부분은 아주 달아요.
The fruit portion of the lunch box is very sweet.
이 생선의 하얀 부분을 먼저 먹어요.
I eat the white part of this fish first.
시장에서 수박의 빨간 부분을 맛봤어요.
I tasted the red part of the watermelon at the market.
샌드위치의 큰 부분은 아빠가 먹었어요.
Dad ate the big portion of the sandwich.
기차에서 김밥의 매운 부분을 친구가 먹었어요.
My friend ate the spicy part of the gimbap on the train.