For a lighter texture, use a bit more pineapple juice and a bit less ice cream, turning it into more of a sippable shake than a spoonable whip. For a richer treat, do the opposite: add extra scoops of vanilla ice cream and just enough juice to keep the blender moving. You can also tuck the filled glasses into the freezer for 20–30 minutes to firm the drink into something closer to soft-serve; give it a quick stir before serving so it looks creamy again. If you like a touch of tartness, mix in a squeeze of lemon juice with the pineapple. A small pinch of salt in the blender will deepen the flavor and balance the sweetness. For kids’ parties, pour the mixture into small paper cups and freeze with popsicle sticks for easy pineapple whip pops. Adults who enjoy cocktails can add a splash of rum to individual glasses, but never add alcohol to the whole batch if children are around—keep an unspiked pitcher separate and clearly labeled. Food safety tips: Keep the ice cream frozen until you’re ready to use it, and don’t let it sit out on the counter for more than about 20 minutes. Use clean utensils and a clean blender jar each time. Store leftover pineapple juice in the refrigerator and use it by the date on the package. Because this drink is made with dairy, don’t leave the finished glasses out at room temperature for more than 1–2 hours; if they’ve sat out longer, it’s safest to discard what’s left rather than refreezing or saving it.