1. Preheat oven to 450°.
2. Cook broccoli rabe in boiling water 4 minutes or until tender. Drain and rinse with cold water. Drain; squeeze excess moisture from broccoli rabe, and pat dry with paper towels. Coarsely chop, and sprinkle with salt.
3. Place pizza crust on a baking sheet. Sprinkle evenly with Manchego cheese. Top with broccoli rabe, chorizo, plum tomato, and red onion. Bake at 450° for 12 minutes or until crust browns. Cut pizza into 8 wedges.