You will want to introduce your customers to as  wide a range of your foods as possible and having tasting samples available is a  good way to get their attention. Bear in mind that even though you may give  samples away free of charge, the law sees this transaction as a sale, and their  production and handling is still subject to legal control. Samples need to be  protected from contamination such as undue handling, usually either from  inquisitive pets or equally inquisitive children, so ensure samples are stored  high up.
If your customers have to handle your food, try and make sure they  don't touch other samples on the plate - cocktail sticks or tongs help to stop  this. Most importantly, don't leave food that must be chilled for safety reasons  out of chill control for long periods, so keep quantities to a minimum and throw  out uneaten food if it has been out of refrigeration for a long time.
The law  permits a maximum of four hours in most cases but it is best if high risk food  is disposed of after one hour out of chill control. Bear in mind that for some  foods, such as hard cheeses, temperature control is not critical to safety and  longer periods are acceptable, so seek advice if in any doubt.
You may  find your local market has its own conditions about food samples as this is at  the discretion of the market organiser rather than any national legal  requirement