Step 1

Place seven 8-ounce plastic cups on a tray small enough to fit into your freezer.

Step 2

Combine the raspberries and 3 cups water in a medium saucepan. Bring to boil and immediately reduce to a simmer. Let the raspberries cook until they've lost their color, about 20 minutes. Strain the mixture through a fine-mesh sieve and discard the solids.

Step 3

Pour the hot liquid back into the saucepan, add the sugar and stir until the sugar is dissolved. Add 2 cups room-temperature water and stir to incorporate. Taste for sweetness, adding a bit more sugar if you’d like. Set aside to cool.

Step 4

Once cooled, pour the mixture into the prepared plastic cups, filling them to about 1/4 inch from the brim. Freeze until fully frozen, at least 8 hours. The limbers will keep in the freezer for up to a month.