Plugrà - Belgian Waffles

Ingredients

• 1 cup plus 2 tbsp (127g) cake flour, sifted
• ½ tsp. (2.5g) baking powder
• ¼ cup (56g) whole milk (3.5% fat)
• 7 oz. (200g) heavy cream, 30-40% fat
• 1 tbsp.(14g) dark rum, optional
• Dash fine sea salt
• 3 large (51g) egg yolks, room temperature
• ½ tsp. (2.5g) vanilla paste or extract
• 4 tsp. (30g) granulated sugar, divided
• 2 large (66g) egg whites, room temperature
• Pinch cream of tartar
• 2 oz. (56g) Plugrá® Premium Butter, unsalted, melted