To prepare strawberry shortcake topping, whisk fresh strawberries, sugar, and lemon juice until the sugar dissolves. Slice the strawberries thinly for even flavor distribution. Whisk in vanilla extract for added richness. For convenience, use a mixing bowl and whisk to incorporate the ingredients thoroughly. Select ripe strawberries and store them properly to preserve their flavor. Avoid overmixing, as this can result in a less flavorful topping.