If you have room for one more dish on your Thanksgiving table, I nominate this one. A crunchy, colorful salad is often what’s missing on the menu, a contrast to all the rich, creamy, brown food that Thanksgiving is usually about. As we know, but sometimes forget, the holiday is a harvest celebration (although where I grew up, in Dallas, it was more about football). A salad with persimmons, radicchio, grapes and walnuts is autumn in a bowl, and of course a few nuggets of blue cheese will only improve it.