In a mixing bowl, combine softened cream cheese, freeze-dried strawberry powder, sugar, and lemon juice. Mix until smooth and creamy.

Take 4 slices of very thin white bread and use a heart-shaped cookie cutter to cut out heart shapes, leaving crusts intact.

Select another slice of bread and generously spread a layer of the strawberry cream cheese mixture on top, reaching the edges.

With the remaining bread slices, repeat the heart-cutting process to create 8 more heart shapes.

Layer the heart-shaped slices: place one filled slice atop a plain heart, then cap it with another filled slice. Repeat for all sandwiches.