Risotto with Butternut Squash, Greens, and Prosciutto

This risotto would be at home in northern Italy, as well as in Portugal, where they combine these same ingredients but bake the rice in a casserole. The sweetness of the squash and the onion are a wonderful contrast with the salty prosciutto and tender greens. For another accent, you may want to add tomatoes, too; “sweet 100” cherry tomatoes or an equally sweet summer tomato would be best, but canned are acceptable.