Grease waffle iron with a small amount of melted butter and heat.

In a large measuring cup, add lemon juice. Add milk and fill to 2 cups. Let's sit at room temperature for 5 minutes.

Melt the butter. Separate egg whites from yolks.

In a large bowl, sift together the flour, sugar, baking soda, baking powder, cinnamon and salt.

In a separate bowl, whisk together egg yolks, milk/lemon (now buttermilk), melted butter and vanilla. Pour into dry mixture and combine.

In a medium bowl, beat egg whites until stiff but not dry. Fold whites into batter.

Bake 3 to 5 minutes until no steam emerges from the waffle iron.

Transfer cooked waffles to a baking sheet. Place in an oven set to low heat (about 200 degrees) while making remaining waffles.