Raspberry Custard Buns (Bringebærsnurrer med vaniljekrem)

Name: Raspberry Custard Buns (Bringebærsnurrer med vaniljekrem)
Prep time: 2 h
Cook time: 15 min
Total time: 2 h 15 min
Cuisine: European
Ingredients: 1¼ cups (300 ml) whole milk; 4 cups plus 2 tablespoons (500 g) all-purpose flour, sifted; 6 tablespoons (75 g) granulated sugar; 2 teaspoons (¼ ounce (7 g)) instant yeast; 1 ½ teaspoons ground cardamom; ¼ teaspoon salt; 2 large eggs, at room temperature; 1/3 cup (75 g) lightly salted butter, cut into small pieces; 4 tablespoons (56 g) butter, at room temperature; 4 tablespoons brown sugar; 1 ½ cups (150 g) frozen raspberries, roughly chopped; 2 large egg yolks, at room temperature; 1/3 cup (65) granulated sugar; 2 tablespoons cornstarch; 2 cups (480 ml) whole milk; ½ vanilla bean, split lengthwise, or 1 teaspoon vanilla extract