In a large pitcher, vigorously mix 1 cup of fresh lemon juice with 1 cup of granulated sugar until the sugar is completely dissolved, which should take about 2 minutes.

Pour 4 cups of cold water into the pitcher and stir well for another minute to combine all the ingredients smoothly.

Divide the lemonade equally into four separate bowls, and add different pastel food colorings to each bowl.

In tall glasses filled with ice cubes, carefully pour the colored lemonade one at a time, starting with the lightest shade.

For the finishing touch, elegantly place thin lemon slices on the rim of each glass and lightly sprinkle edible glitter atop the layered lemonade.

Chill the glasses in the refrigerator for a few minutes before serving to ensure they are refreshingly cool.