01 - Preheat oven to 350°F. Grease and flour two 8-inch round cake pans. Line bottoms with parchment paper.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl.
03 - Beat butter and sugar in a large bowl until light and fluffy, about 3-4 minutes.
04 - Add eggs one at a time, beating well after each. Mix in lemon zest and vanilla extract.
05 - Combine lemon juice, milk, and sour cream in a separate bowl.
06 - Alternately add flour mixture and lemon-milk mixture to butter mixture on low speed, beginning and ending with flour. Mix until just combined.
07 - Gently fold in chopped strawberries. Add food coloring if desired for pink hue.
08 - Divide batter evenly between prepared pans and smooth tops. Bake for 28-32 minutes until a toothpick inserted into center comes out clean.
09 - Let cakes cool in pans for 10 minutes, then turn out onto wire racks to cool completely.
10 - Beat butter until creamy. Add powdered sugar, lemon zest, lemon juice, salt, and 2 tbsp cream. Beat until fluffy, 3-5 minutes, adding more cream if needed for desired consistency.
11 - Level cake tops if needed. Spread buttercream layer between cakes, then frost top and sides.
12 - Arrange fresh strawberries and lemon slices or zest curls on top and sides of frosted cake.