Remove the compote from the refrigerator and allow it to come to room temperature while you prepare your pan and coating.
Line a 9x13 inch metal baking pan with parchment paper.
In a shallow bowl or plate, whisk together the granulated sugar, cornstarch, and lemon zest for the coating. Set aside.
Dump the proofed dough out onto a greased surface. Pinch off a golf ball sized chunk of dough (You can make the balls as large or as small as you desire) and, working one piece at a time, dip it into the cooled strawberry compote and coat generously on all sides. Immediately roll it in the lemon zest sugar cornstarch mixture until fully coated, then place it in the prepared pan. Repeat until all the dough has been used, arranging the pieces so they are touching each other in the pan.
You will not use all the compote. Save the leftover compote to apply after baking for 20 minutes. See baking instructions below.
Cover the pan loosely with plastic wrap or a bag and let rise at room temperature for 1 to 2 hours, until the pieces have puffed up, grown together, and jiggle gently when you shake the pan.
Preheat your oven to 425 degrees F. Once the dough has completed its second rise, dimple the surface firmly with your fingers all over.
Bake for 20 minutes. Remove the pan from the oven and spoon any remaining strawberry compote generously over the top, spreading it into the crevices between the balls. Adding the compote to the top partway through rather than at the start protects the strawberry pockets from drying out during the full bake time.
Return the pan to the oven and bake for an additional 10 minutes, or until the internal temperature reaches 200 to 205 degrees F and the edges are deep golden brown. If the top is browning too quickly at any point, tent loosely with foil. Cool in the pan for 10 minutes.
While the focaccia cools, make the vanilla glaze. Sift the powdered sugar into a bowl. Add the vanilla extract and cream one tablespoon at a time, whisking until smooth and thick. The glaze should be thick and spreadable. Add more cream to make it thinner to when drizzles slowly off a spoon. A thick glaze is what gives you that crackly shell once it sets.
Apply the glaze generously over the warm focaccia, making sure every piece gets covered. For a fun variation, stir 1 to 2 tablespoons of freeze-dried strawberry powder into the glaze before drizzling, or crush freeze-dried strawberries and sprinkle them over the wet glaze before it sets. Let the glaze set for a few minutes before serving. It will harden into a crackly white finish as it cools.
Pull apart and enjoy. Each piece is fluffy, jammy, and fully loaded with strawberry shortcake flavor.