Wash and pit the plums. Add them to a high speed blender along with the water and puree until completely smooth. You will see the color develop as the machine pulverizes the peels. When it's as smooth as you can get it (you will still see very tiny bits of peel) transfer to a medium saucepan.
Add sugar and lemon juice to the pan and stir to combine. Bring the mixture to a full boil, stirring with a silicone spoonula almost constantly so it doesn't scorch.
Strain the mixture through a mesh strainer. Push it through with the back of your silicone spoon so you get as much through as possible. You should only be left with a thin dry layer of solids. You'll have about 2 cups of plum puree/syrup. Chill the syrup.
When ready to make your cream soda, fill a glass with crushed ice. Add about 1/4 cup of the plum syrup to the glass. Fill almost to the top with sparkling water. Drizzle cream into the glass. Serve as is or top with whipped cream and a cherry.
Notes
To make your Italian cream soda with readymade flavoring syrup
Follow the directions in step 4 of my recipe substituting readymade syrup for the scratch made fruit syrup. Readymade syrup is quite concentrated, so you will use less of it ~ start with 2 tablespoons and add to taste.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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