Butternut Squash and Caramelized Onion Galette without garlic

1 1/4 cups all-purpose flour 1/4 teaspoon salt 8 tablespoons unsalted butter , cut into pieces 1/4 cup fat free sour cream 2 teaspoons fresh lemon juice 1/4[...]

6 cups (1/2-inch) cubed peeled butternut squash 2 tablespoons extra-virgin olive oil, divided 2 tablespoons chopped fresh sage 12 garlic cloves, unpeeled[...]