I love finding out which of the best non-halal joints actually do serve halal food. When I found out honest burgers have 2 halal sites (their Tooting & Baker Street branches) I was so eager to try it, especially as I know how popular this joint is to non-Muslims. These halal branches of honest burgers serve halal chicken only (no halal beef), and it’s all handled & cooked separately. All their sides are also gluten free and any of their burgers can be made to be gluten free too!
Keep up to date with them through their website and instagram.