Butternut Squash Mac and Cheese

Bahan-bahan (6 porsi)

• 2 tablespoons butter (or olive oil)
• 12 fresh sage leaves (optional)
• 3 large cloves garlic, minced
• 1 pound (about 4 cups) diced butternut squash*
• 1 1/2 cups vegetable stock (or chicken stock)
• 1 pound uncooked pasta (I used shells)
• 2 cups whole milk
• 8 ounces good-quality sharp cheddar cheese, shredded*
• fine sea salt and freshly-cracked black pepper, to taste