冷奴

1. Origins, structure, and basic meaning

• Structure: 冷奴（ひややっこ） means a dish of tofu served cold.
• Basic usage: Use it for a side dish on a hot day or when adding toppings such as green onions.

2. Common pitfalls and similar expressions

• The food versus the dish
  • 豆腐 broadly refers to tofu as a food; 冷奴 refers to a tofu dish served cold.