Hungarian Paprika-Spiced Cauliflower and Dumpling Soup (Karfiolleves)

Ingredients

• ¹⁄₃ cup flour
• ¹⁄₂ tsp. kosher salt
• 6 tbsp. unsalted butter, cubed and chilled
• 1 egg
• 1 ¹⁄₂ tbsp. Hungarian hot paprika
• 1 large yellow onion, finely chopped
• 6 cups vegetable stock
• 1 small head cauliflower, large stem removed, cut into florets
• 1 medium carrot, peeled and finely chopped
• Kosher salt and freshly ground black pepper, to taste
• 1 small bunch flat-leaf parsley, stemmed and finely chopped