Place the hulled strawberries and blueberries into the blender.
1 cup fresh strawberries, 0.5 cup fresh blueberries
Add the lemon juice, yogurt (if using), and ice cubes to the blender.
1 tablespoon lemon juice, 0.5 cup plain yogurt, 0.5 cup ice cubes
Blend on high speed until the mixture is smooth and creamy, with no visible chunks. The color should be vibrant and evenly blended, and the texture thick and frosty.
Stop the blender and check the consistency. If the smoothie is too thick, add a splash of water or juice and blend briefly to incorporate.
Pour the smoothie into glasses. Optionally, garnish with fresh berries or a lemon wedge for visual pop.
Serve immediately while frosty and vibrant, enjoying the bright layers of color and creamy texture.