Rigatoni Labu dengan Renyah Walnut Rosemary

Bahan-bahan (6 porsi)

• 2 tablespoons butter
• 4 cloves garlic, thinly sliced or minced
• 1 cup pumpkin puree
• 1 cup chicken or vegetable broth
• 1 cup heavy cream
• 1 -2 teaspoons kosher salt
• squeeze of lemon
• 1 lb . rigatoni
• 1 cup walnuts, chopped
• 1 tablespoon finely chopped fresh rosemary leaves
• 1 tablespoon melted butter
• 1 -2 tablespoons brown sugar (I like 2)
• 1/2 teaspoon kosher salt (more to taste)
• black pepper to taste