Generally, the bulk of the ingredients are gluten-free, but there is one catch: Barley malt vinegar. Part of the original recipe, this component still shows up in certain Worcestershire sauce ...

“I like to reduce the cost by using half mince and half lentils and once again use gluten-free stock cubes. Some recipes call for Worcestershire sauce and you can buy a gluten-free version but ...

and make sure you use gluten-free Worcestershire sauce. To make them dairy-free, leave out the cheese and sour cream, or replace with dairy-free alternatives such as coconut yoghurt.