Sauteéd Brocolli Rabe with Prosciutto, Mushrooms, and Caramelized Onions

butter or olive oil

small onion, diced 1/4", 8 ounces

crimini mushrooms, washed an sliced 1/4" thick, 8 ounces

slices of prosciutto, 1 1/2 ounces, torn or cut into small 1/2" pieces

garlic, minced

chopped fresh thyme

stems broccoli rabe, 12 ounces, washed

water

sea salt and freshly ground black pepper