Slice the strawberries and toss them in a medium bowl with the sugar and vodka or kirsch, if using. I left the alcohol out. Stir until the sugar begins to dissolve and all of the strawberries are coated. Let stand at room temperature for 1 hour, stirring occasionally.
Pulse the strawberries and their liquid with the sour cream, heavy cream, and lemon juice in a blender or food processor until almost smooth, but still slightly chunky.
Refrigerate mixture for at least one hour. Freeze in your ice cream maker according to the manufacturer’s instructions.