In a medium bowl, add the strawberries and sugar. Stir until strawberries are coated. Refrigerate strawberries until serving time. Center a rack in the oven and preheat the oven to 400 degrees F. Line a baking sheet with parchment or a silicone mat.: The first sensory cue is the shine on the strawberries as they begin to release juice, a gentle syrup that smells brightly of fruit and sugar. This step mellows the berries and creates a saucy component that will contrast with the pastry. While the strawberries sit, the kitchen fills with a sweet, fresh aroma; that is your signal to prepare the dough. A common mistake is to let the berries sit too long at room temperature, which can make them overly soft and watery, so chilling preserves texture. Also, preheating to 400 degrees F ensures the shortcakes start baking immediately, helping them rise properly.
Whisk the flour, sugar, baking powder, salt, and orange zest together in a large bowl. Drop in the butter and, using your fingers, toss to coat the pieces of butter with flour. Use your fingers or a pastry blender, cut and rub the butter into the dry ingredients. You will have some small pea size pieces of butter and that is fine. Stir in the chopped rhubarb.: As you whisk the dry mix, inhale the citrus perfume from the orange zest , which lifts the whole batter. Rubbing in the chilled butter yields a gravelly, sandy texture with visible pea size bits, and you should still see little flecks of solid butter among the flour; those pockets are what create flaky layers. When you stir in the chopped rhubarb , the mixture gains pink flecks and a rustic look. Avoid overworking the fat into the flour, because if the butter melts, the shortcakes turn dense instead of tender.
In a small glass measuring cup or bowl, whisk together the egg, heavy cream, and vanilla extract. Pour mixture over the dry ingredients and stir with a spatula just until the dough comes together. The dough will be sticky. Still in the bowl, gently knead the dough by hand, just until the dough comes together.: The liquid mixture should smell faintly of vanilla extract and feel cool to the touch. Pouring it over the dry mix will produce a shaggy, tacky dough that clings slightly to the spatula. Kneading in the bowl by hand creates a cohesive mass without overdeveloping gluten, so stop when the dough holds together. If you overmix, the dough will become tough and lose its tender lift; use light, folding motions and resist the urge to keep working it.
Lightly dust a work surface with flour and turn out the dough. Pat the dough into a circle. Gently roll out the dough. You want the dough to be about an inch thick. Cut the dough into shortcakes using a cookie cutter, biscuit cutter or glass bottom. Place the shortcakes on the prepared baking sheet, about 2 inches apart.: When you turn out the dough, you will hear a soft, floury whisper as it meets the board, and the surface should feel cool and slightly tacky. Patting and rolling to about an inch gives you the ideal balance between flaky interior and a tender crumb. Pressing too thin will lose the flaky lift, while too thick will lengthen baking and might leave the center doughy. When cutting, press straight down without twisting to keep edges neat, and place the rounds with space so heat can circulate and the edges brown evenly.
Brush the shortcakes with cream and sprinkle with turbinado sugar. Bake for 12-14 minutes, or until golden brown. Transfer shortcakes to a rack and cool to cool to room temperature.: Brushing with extra cream gives a glossy sheen and helps the coarse turbinado sugar adhere, creating a gentle crackle as it bakes. During the bake you will hear a soft whisper from the oven and the aroma will shift to warm, toasty notes. Look for golden tops and slightly darker edges as the cue to remove them; an uneven color means your oven has hot spots, so rotate the sheet if necessary. A common pitfall is opening the oven frequently, which can cause the shortcakes to bake unevenly. Move them to a rack to cool so steam does not make the bottoms soggy.
Serve shortcakes with strawberries and whipped cream.: The final sensory payoff is the contrast of textures and temperatures, the cool, fruity syrup against warm, flaky pastry and billowy whipped cream . Spoon a generous heap of the chilled strawberries onto the split shortcake and top with a cloud of whipped cream , so each bite combines crisp edge, tender interior, juicy fruit, and creamy finish. A frequent mistake is to assemble too early, which softens the pastry; serve promptly to preserve the texture contrast.