Immediately pour the strawberry lemonade slushie into tall mason jars. Serve right away while it’s thick and icy, before it starts to melt.
To turn this into a party drink for adults, blend in a small splash of vodka, rum, or tequila after the slushie is already thick and icy, pulsing just until combined so you don’t thin it out too much. For a slightly lighter version, replace part of the lemonade concentrate with cold water or sparkling water to cut the sweetness and add a bit of fizz. You can also swap half of the frozen strawberries for frozen raspberries for a deeper berry flavor and a darker pink color. If you’re making this ahead for a crowd, blend a double batch, pour it into a shallow freezer-safe container, and freeze; scrape and re-blend with a handful of ice right before serving to bring back that smooth, frosty texture. For kids who love “fancy” drinks, pour the mixture into reusable popsicle molds instead of glasses and freeze into strawberry lemonade slush pops. If your strawberries aren’t very sweet, you can add a teaspoon or two of sugar or honey, but start small—the lemonade concentrate already brings plenty of sweetness and tartness.