Start by making the strawberry reduction:
• Puree the strawberries in a blender or food processor until smooth. Transfer to a small pot, add the sugar and lemon, and bring to a simmer.
• Continue to simmer, uncovered, for 15 – 20 minutes to allow the liquid to thicken a little, stirring regularly. It should be almost like a tomato sauce.
• When done, remove from heat and allow to cool to room temperature before using.
Next, start to make the cupcakes:
• Preheat the oven to 350°F and prep the cupcake pan with liners.
• In a large bowl, add the milk, vanilla, lemon juice, lemon zest, vegetable/sunflower oil, sugar, salt, and strawberry reduction. Stir well.
• Take 1 cup of the flour at a time and sift directly into the bowl. Slowly fold the flour into the wet ingredients so there are no lumps. Try to avoid using a whisk and overworking the batter, as a whisk will beat out the fluffiness of the sifted flour.
• With the 3rd and last cup of flour, add in the baking soda and baking powder to the sifter. Sift into the batter and then again gently fold and try to avoid lumps.
• Using a ladle, scoop some batter and place into a cupcake liner in the cupcake pan. Fill each liner about ¾ of the way to the top.
• When all the batter has been used, place the cupcake pans into the oven and bake for 15 minutes.
• When done, keep the cupcakes in the pan and allow to cool to room temperature.
While the cupcakes are baking/cooling, make the frosting:
• Using an electric mixer with a whisk attachment, whisk the shortening and butter. (you can do this by hand if you want, but it’s going to be A LOT of whisking)
• Add the powdered sugar one cup a time, allowing the sugar to mix in well. You will probably need to scrape down the sides of the bowl periodically.
• After all the powdered sugar has been incorporated, at the remaining frosting ingredients. Whisk everything together for several minutes on medium speed. This will infuse some air into the frosting, making it lighter and fluffier.
• Once the cupcakes have cooled, pipe or spread some frosting on top of the cupcakes. Garnish with a sliced strawberry.
• If not serving immediately, place into an air-tight container and refrigerate.