To prepare a strawberry eton mess for mothers day recipe, you'll first need to prepare the ingredients. First, preheat the oven to 375 degrees F (190 degrees C). Then, mix together the granulated sugar, butter, and vanilla until smooth. Next, add the strawberry mixture and stir to combine. Pour the mixture into an ice cream sundae mold and freeze until firm, about 30 minutes. Serve with whipped cream and fresh strawberries.