Buttersquash Soup – French Women Don't Get Fat

Ingredients

• 1 medium butternut squash, peeled and cut into large pieces
• 1 large yellow onion, peeled and coarsely chopped
• 1⁄2 pound red-skinned boiling potatoes (about 2 or 3), peeled and cut into 1⁄2-inch cubes
• 6 cups water
• 4 tablespoons unsalted butter
• Salt and freshly ground pepper