01 - Rinse the dandelion petals thoroughly in cold water, gently patting them dry with a clean towel.
02 - Place the dandelion petals in a heatproof bowl, pour 2 cups of boiling water over them, cover, and let steep for 10 minutes.
03 - Strain the dandelion infusion through a fine mesh sieve, discarding the spent petals, and allow the liquid to cool slightly.
04 - In a large pitcher, combine the dandelion infusion, freshly squeezed lemon juice, and sweetener, stirring until the sweetener fully dissolves.
05 - Add the remaining 3 cups of cold water, taste, and adjust the sweetness level as desired.
06 - Refrigerate the lemonade for at least 1 hour to allow the flavors to meld and the beverage to chill thoroughly.
07 - Pour over ice and garnish with lemon slices and additional dandelion petals if desired.