Wash, hull, and thoroughly dry the strawberries. Pat dry with paper towels. If desired, cut into tulip or heart shapes for a decorative touch.
Add softened cream cheese to a large mixing bowl. Using a stand mixer or hand mixer, whip on high speed for 2–3 minutes until light and fluffy.
Add the heavy whipping cream, vanilla extract, and powdered sugar. Continue whipping on high speed, scraping down the sides as needed, until the mixture holds stiff peaks.
Fold in the lemon zest gently with a spatula until just combined.
Spread a generous, even layer of cream mixture onto every slice of bread.
On half of the bread slices, arrange the strawberries cut-side down. Place the most visually appealing berries in the center, pointing in the direction of your planned diagonal cut. Fill in the sides with smaller berry pieces. Gaps are fine - the cream will fill them.
Spread another generous layer of cream on top of the strawberries. Don't be shy - this prevents any empty pockets inside the sandwich.
Press a cream-covered bread slice on top of each strawberry-loaded slice. Gently press together.
Use a knife to lightly score a diagonal line across the top of each sandwich in the direction you plan to cut. This is your guide for slicing later.
Wrap each sandwich tightly in plastic wrap.
Place wrapped sandwiches on a tray. Set something slightly heavy on top (like a carton of eggs) to gently compress the cream into all the gaps.
Refrigerate for at least 2 hours (or overnight).
When ready to serve, remove the plastic wrap. Using a sharp serrated knife, trim off all four crusts - rotating the cutting board (not the sandwich) as you go. Clean the knife between every cut.
Make the final diagonal cut along your scored line. Admire the beautiful strawberry reveal. Serve immediately.