Scalloped Potatoes and Butternut Squash With Leeks

I experimented with two dishes tonight for Christmas. The first (a cranberry tofu with a cranberry and orange chutney) was a disaster, but the second was[...]

3 cups leeks , washed very well and then thinly sliced (about 6 large, white and pale green parts only) 1/2 cup unsalted butter 3 1/2 cups whole milk 6[...]