Prepare Frozen Fruit Base: In a large bowl, combine frozen strawberries, blueberries, raspberries, and ice. Toss to mix.
Blend the Cocktail: Add pineapple juice, rum (if using), and lime juice to the bowl. Sweeten with agave nectar or simple syrup.
Blend on low speed, gradually increasing to high, until smooth and slushy. Add more pineapple juice if too thick, or more frozen berries/ice if too thin.
Assemble and Serve: Pour into chilled glasses. Garnish with fresh blueberries, strawberry slices, and lime wedges. Serve immediately.
Notes
Non-Alcoholic: Omit the rum or substitute with sparkling water or ginger ale.
Fruit Variations: Experiment with mango, peaches, or pineapple.
Sweetness: Adjust agave nectar/simple syrup to taste.
Extra Fizz: Add a splash of sparkling water or club soda.
Layered Effect: Blend each fruit separately and layer in the glass.
Rim the Glass: Wet the rim with lime and dip in sugar or salt.
Mocktail Popsicle: Pour into popsicle molds and freeze.
Make Ahead: Combine frozen fruits and ice in a freezer-safe bag.
Troubleshooting:
Too thick: Add pineapple juice or water.
Too thin: Add frozen berries or ice.
Not sweet enough: Add more agave nectar or simple syrup.
Blender struggling: Break up frozen fruit and add liquid.