Caribbean Pumpkin Soup

Name: Caribbean Pumpkin Soup
Ingredients: 3 tbsp. unsalted butter; 4 cloves garlic, minced; 1 medium white onion, minced; 1 Scotch bonnet pepper, stemmed, seeded, and minced (optional); 3 lb. pumpkin, such as calabaza or butternut squash, peeled, seeded, and cut into 1/2″ pieces; 4 cups chicken stock; 4 sprigs thyme; 2 sprigs parsley; 1 bay leaf; 1 cup milk; 1⁄4 cup heavy cream; 1⁄2 tbsp. mild curry powder; 1 tsp. fresh lime juice; 1⁄4 tsp. freshly grated nutmeg; Kosher salt and freshly ground black pepper, to taste; Crème fraîche, for garnish