Turn on the waffle iron and let it heat up.Meanwhile, mix all the ingredients together in a bowl and whisk until there are no lumps left. You can also choose to add a bit of oil if you're not entirely sure if the waffles will release from the iron. Bake the waffles in the hot waffle iron. It depends on your waffle iron, but mine took about 5 minutes each. If the first waffle has trouble releasing from the iron, you can still add a bit of oil to the remaining batter.Serve the crispy lentil waffles immediately!