Preheat oven to 400°. Place a 10-inch cast-iron skillet in oven while preheating.
In a small bowl, whisk together 3 tablespoons granulated sugar and lemon zest. In a medium bowl, stir together half of strawberries and 2 tablespoons lemon sugar. In another medium bowl, stir together lemon juice, remaining strawberries, and remaining lemon sugar; cover and reserve.
Carefully remove skillet from oven; add 3 tablespoons butter, swirling to coat. Add strawberries with just lemon sugar. Bake until strawberries are bubbling and fragrant, 10 to 12 minutes.
Meanwhile, in the container of a blender, process together eggs, flour, half-and-half, vanilla, cardamom, salt, remaining 2 tablespoons melted butter, and remaining 1 tablespoon granulated sugar until smooth. Carefully pour batter all over strawberries in skillet.
Bake until puffed and golden brown, 18 to 20 minutes. Dust with confectioners’ sugar. Serve immediately with reserved strawberry mixture.
Recipe by Southern Cast Iron at https://southerncastiron.com/roasted-strawberry-dutch-baby/