Preheat the oven to 225°. Line a baking sheet with parchment paper. In a bowl, preferably copper, beat the egg whites on medium speed until frothy, 2 to 3 minutes. Gradually add 1 1/2 tablespoons of the granulated sugar and beat for 1 minute. On high speed, beat in the remaining 3 tablespoons sugar; beat until stiff and glossy, about 2 minutes.