My mother made these. Start with 1/2 a cup of fruit (cherries, berries, peaches, etc.) I used blackberries for this one. Put it in a blender with a few ice cubes, a 1/2 cup of milk and a teaspoon of sugar if you like. Blend it until the ice dissolves and it’s done.
This was a candy store specialty only available in Summer. A squirt each of cherry and lemon-lime syrup. Add seltzer, stir and a squeeze of fresh lime.
Also a standard in candy stores, it was a couple of ounces of chocolate syrup (U-BET), a couple of ounces of milk, and stir with seltzer. The sum much more than the parts.
You could get this one in cafes, some pastry shops and Italian owned candy stores. A few ounces of Orzata syrup poured over ice and then fill the glass with water or some preferred seltzer. Simple and refreshing. It tastes a bit like marzipan.