Braised Endive with Prosciutto and Gorgonzola

Name: Braised Endive with Prosciutto and Gorgonzola
Ingredients: 2 tablespoons unsalted butter; 1 tablespoon granulated sugar; ¼ teaspoon ground nutmeg (preferably freshly grated); 10 large belgian endive heads, roots trimmed and outer leaves discarded; 1 tablespoon fresh lemon juice; ¼ cup dry white wine; 1 teaspoon flaky sea salt; ¼ teaspoon freshly ground black pepper; ¼ cup crème fraîche; ¼ cup heavy cream; ¼ pound (about 4 thin slices) prosciutto; ½ cup crumbled gorgonzola cheese