Non-staple food refers to various foods such as fish and vegetables used for meals other than staple foods such as flour and rice.

Non-staple food: refers to fish, vegetables and other products used for meals.

[another explanation]

Non-staple food, that is, non-staple food, is generally processed food, including sugar, candy, canned food, tea, condiments, dairy products, honey products, bean products, beverages, biscuits, cakes, snacks, cigarettes, wine, fruits, etc. In the era of planned economy, staple food and non-staple food were strictly managed separately.