Mix the dry ingredients (barley flour, sugar, baking powder) in a bowl until thoroughly combined
Form a depression in the center of the mix and add oil, milk and eggs. Mix to incorporate but no more than that. You may have to add more milk to achieve the desired consistency. The batter shouldn’t be runny but it should flow.
Deposit about 1/3rd of a cup of batter at the center of the waffle iron and follow the procedures appropriate for the type of iron you are using.