Authentic Germknödel Recipe Austria, Europe

Name: Germknödel with Vanilla Sauce
Prep time: 30 min
Cook time: 15 min
Yield: 4 servings
Cuisine: Central European
Ingredients: DUMPLING DOUGH; 2 cups (250g) all-purpose flour; 1/2 tsp (3g) salt; 2 tbsp (30g) sugar; 12g fresh yeast (or 1 tsp active dry yeast); 2 tbsp (30g) butter, melted; 1/2 cup (120g) milk, warmed; 1 egg, beaten; zest from half of lemon; 1/2 tsp (3g) vanilla extract; FILLING; 1/2 cup (100g) powidl, thick plum jam; 1 tsp (5g) rum, optional; FOR SERVING; 1/4 cup (25g) poppy seeds, ground; 2 tbsp (15g) powdered sugar; VANILLA SAUCE; 2 egg yolks; 1 tbsp (8g) cornstarch; 2 tbsp (30g) sugar; 2 tsp (10g) vanilla extract; 1 1/4 cup (300ml) milk; 3/4 cup (200g) whipping cream, 35% fat