Butternut Squash With Pistou without milk salad broth

2 small butternut squash, halved and seeds removed 2 tablespoons brown sugar 1/4 teaspoon ground mixed spice 1 pinch salt 2 tablespoons butter , melted 1/3[...]

5 tablespoons unsalted butter 6 cups peeled seeded cubed butternut squash, cut into 1/2-inch cubes 2 cups chopped leeks , white and light green parts only 1/2[...]