Add rhubarb, strawberries, if using, sugar and water to a saucepan over medium-low heat and cook for 8-10 minutes. Use wooden spoon or potato masher. Stir frequently. Cook until the rhubarb is broken down into a sauce. Set aside and allowto cool to room temperature.
After simmering rhubarb, you have option to puree using an immersion blender and strain mixture if you want a totally smooth textured ice cream. We never do.
In a large bowl, begin whipping your heavy whipping cream in a chilled bowl using an electric hand mixer. Begin on low until the cream forms bubbles, and then increase your speed to high. Mix for about 4 minutes on high or until your cream is thick and forms stiff peaks.
After your cream is fully whipped, fold in the condensed milk using spatula. Use hand mixer to blend cream mixture on low for less than 10 seconds to make sure totally blended.
Next, using a whisk, gently fold in the rhubarb mixture and stir until the rhubarb is fully blended.
Pour the ice cream mixture in a 9”x5” loaf pan. Cover and place in the freezer for 6 hours or overnight, covered tightly with plastic wrap.
Remove the ice cream from the freezer a few minutes before serving and enjoy every bite!