Brussels waffles are prepared with an egg-white-leavened or yeast-leavened batter, traditionally an ale yeast; occasionally both types of leavening are used together. They are lighter, crisper and have larger pockets compared to other European waffle varieties, and are easy to differentiate from Liège Waffles by their rectangular sides. In Belgium, most waffles are served warm by street vendors and dusted with confectioner's sugar, though in tourist areas they might be topped with whipped cream, soft fruit or chocolate spread. Variants of the Brussels waffles – with whipped and folded egg whites cooked in large rectangular forms – date from the 18th century. However, the oldest recognized reference to "Gaufres de Bruxelles" (Brussels Waffles) by name is attributed from 1842/43 to Florian Dacher, a Swiss baker in Ghent, Belgium, who had previously worked under pastry chefs in central Brussels. Philippe Cauderlier would later publish Dacher's recipe in the 1874 edition of his recipe book "La Pâtisserie et la Confiture". Maximilien Consael, another Ghent chef, had claimed to have invented the waffles in 1839, though there's no written record of him either naming or selling the waffles until his participation in the 1856 Brussels Fair. Neither man created the recipe; they simply popularized and formalized an existing recipe as the Brussels waffle.
Just as important, nonstick surfaces are significantly easier to clean. This also means the waffle iron will last much longer, since you won’t be scratching the iron trying to clean it out. Many experts suggest using some kind of oil (be it butter or something veggie-based like a spray) to help release your waffle from the iron, but even after a few years of testing our non-stick coatings have held up well and we wouldn’t say that oil is necessary. A little bit of butter is very nice, though, and gives some extra crispiness.
American-style waffle irons are used to make traditional waffles, which are thin and crispy with relatively shallow pockets. This means they cook fairly quickly, too. The savory batter used for this type of waffle makes it particularly well-suited to making special shapes like hearts, or for use in place of bread for things like breakfast sandwiches.
When the temperature exceeds the desired setting, the strip "warps" and breaks the contact causing the resistance coils to cool. Because the iron is not being heated, the temperature falls and consequently the bimetallic strip "un-warps" and makes contact again, causing the coils to re-heat the iron. In this way, a continuous temperature is maintained in the cooking irons.