Add oil, sour cream and milk to cake mix and mix until smooth in a stand mixer with whisk attachment or with hand mixer
Add lemon zest and lemon juice and mix until just combined (be sure to strain the seeds and lemon chunks out of the freshly squeezed juice before adding to cake mix.)
Add eggs one at a time and mix well between each
Fill cupcake liners ¾ full (about ¼ cup - these cupcakes do not rise much)
Bake 15-20 minutes or until toothpick comes out clean when inserted
Remove from oven and let sit for 2 minutes, then remove cupcakes from pan and let them cool completely before frosting
Strawberry Buttercream Frosting
Puree strawberries in blender or food processor
Heat pureed strawberries in saucepan on low-medium heat until boiling. Simmer for 15-20 minutes, stirring frequently.
Remove from heat and let sit until completely cooled
Once strawberry sauce is cooled, strain into a separate bowl to remove chunks and seeds.
In stand mixer beat butter until smooth and fluffy
Add 1 cup powdered sugar to butter and mix well
Mix in half of pureed strawberries
Add another cup powdered sugar, then remaining strawberries, then final cup of powdered sugar, mixing well between each addition
Add milk and continue to mix until frosting is the consistency that you want (the frosting will be whippy)
Add frosting to piping bag with desired piping tip and pipe in circular motion onto completely cooled cupcakes (I used a 16 inch piping bag and a Wilton 1M Open Star piping tip)
Recipe by Poppy + Grace at https://poppyandgrace.com/2018/06/strawberry-lemonade-cupcake-recipe/