If you use fresh spinach, it should be rinsed and dried first. If you use frozen spinach, add 20 grams more flour to the recipe, as it's wetter than fresh spinach. The recipe is super simple: Mix all ingredients in a blender and blend until smooth and free of lumps. Let the mixture rest for 15 minutes at room temperature. We have a non-stick waffle iron, so we add the oil to the batter. If you don't have a non-stick waffle iron, we recommend adding a bit of oil with each baking instead of putting it in the batter. Bake your waffles until they are golden, and be careful not to overfill your waffle iron (as you can see below :-() :