Several hours before, mashed all strawberries, stirred in sugar and 1/2 teaspoon lemon juice to enhance strawberry flavor. Let sit until sugar is dissolved. Did not cook. Added a teaspoon of vanilla.
I made some lower-fat substitutions (2% milk for half and half and reduced fat sour cream) and was very pleased with this recipe. The "zing" was less than expected; sweet and nicely tart seems more descriptive. I reserved about 1/2 cup of the fresh, chopped strawberries and added them when the mix was soft frozen.