Add the frozen strawberries, fresh strawberries, lime juice, sweetener, cold water, and ice cubes to a blender.
Blend until smooth and slushy. If the mixture is too thick, add a little more cold water or lemonade, one tablespoon at a time, until you reach your desired consistency.
Taste and adjust. Add more lime juice if you want it tangier, or more sweetener if you prefer a sweeter mocktail.
Pour into chilled glasses. Garnish with fresh mint, a lime slice, or a strawberry on the rim of the glass.
Serve immediately while cold and frosty.
Notes
Strawberries: Frozen strawberries help create that classic thick, icy daiquiri texture. Fresh strawberries add natural sweetness and a fresh berry flavor. You can use only frozen strawberries if you want a thicker drink.Lime juice: Fresh lime juice is best. Bottled lime juice can taste sharp or artificial, so freshly squeezed lime gives the drink a cleaner and brighter flavor.Sweetener: Sugar, honey, agave syrup, or simple syrup all work well. Adjust the amount depending on how sweet your strawberries are.Liquid: Cold water keeps the drink light, lemonade makes it sweeter and more citrusy, and sparkling water adds a fizzy finish.