Whisk sugar and Sure Jell together in a medium saucepan.

Add water and whisk. Turn on heat to medium high and whisk while bringing to a boil.

Boil for 1 minute, whisking constantly.

Pour sugar mixture into crushed raspberries. Stir well with spatula.

Immediately fill clean jars, leaving 1 inch head room. Set out at room temperature for 24 hours. Place in the freezer.