手軽

1. Origins, structure, and basic meaning

• Structure: 手軽 (てがる) describes something that can be done easily without much effort or preparation. Both examples use its adverbial form.
• Basic usage: Frozen vegetables are easy to add to a dish; a convenient tool is easy to use for repairing a desk.

2. Common pitfalls and similar expressions

• Ease of adding an ingredient and ease of using a tool
  • 手軽に料理へ加えられる evaluates the act of adding vegetables, while 手軽に使える evaluates using a tool. Neither describes an object's physical weight.