[header] How to use lemon to prevent fruits and vegetables from turning brown [title] Keep a few fresh lemons or a bottle of lemon juice on hand at all times. [step] Since you may never know when you are going to need to maintain the integrity of cut fruit or vegetables for more than a few minutes. [title] Know which fruits and vegetables will have a positive interaction with lemon. 
[step] In some cases you could pour lemon juice all over the produce and it won't make any difference. Have a list of which fruits and vegetables will not turn brown with lemon : [substeps] Cut fruits include apples, pears, bananas and peaches.