Light a grill. In a large bowl, toss all of the vegetables with olive oil and season with salt. Pull out the Broccolini and grill over moderately high heat until lightly charred, about 1 minute per side. Transfer to a large plate. Pull out the asparagus and carrots and grill for about 1 minute, until lightly charred; transfer to the plate. Grill the radishes, tomatoes and onion wedges, cut sides down, until lightly charred, about 2 minutes. Add to the other vegetables.