Crispy Waffles

Mix the dry ingredients: In a large mixing bowl, sift together the flour, sugar, baking powder, and salt.

Prepare the batter: In a medium-sized mixing bowl, whisk the egg yolks, milk, vinegar, melted butter, and vanilla until well-combined. Add the egg yolk mixture to the flour mixture and stir to just combine, being careful not to overmix; there should be a few small lumps of flour in the batter

Preheat the Waffle Iron

Whip the egg whites: In a perfectly clean stainless steel mixing bowl, beat the egg whites until foamy. Add the cream of tartar, then continue to beat until soft peaks form.

Fold the whipped whites into the batter: With a silicone spatula, gently scoop the whipped whipped egg whites into the batter. Then scoop them from underneath, along with some of the batter, very gently turning the whole thing over. Repeat until just incorporated