1 1/2 cups pineapple sherbet
2 cups pineapple juice
6 fluid ounces vanilla-flavored vodka
2 fluid ounces butterscotch-flavored schnapps
4 splashes grenadine syrup
Blend sherbet, pineapple juice, vodka, and schnapps in a blender until well combined, 10 to 15 seconds.
Pour a splash of grenadine into 4 martini glasses. Pour drink mixture into each glass.