For the dressing: In a large bowl, whisk together the mustard, vinegar, extra-virgin olive oil and salt until emulsified. Add the basil, parsley, tarragon and Parmesan and stir to combine.
For the salad: Heat a medium skillet over medium heat. Add the olive oil and prosciutto and cook, stirring often with a wooden spoon, until the prosciutto is brown and crispy, about 6 minutes. Using a slotted spoon, remove the prosciutto to a paper towel-lined plate. Let cool.
Heat a grill pan over high heat. Place the melon wedges in the pan and grill until nice grill marks appear and the melon is slightly caramelized, about 1 minute per side. Remove to a cutting board and chop into bite-size pieces.
Add the grilled melon, pasta and olives to the bowl with the dressing and toss well to coat. Sprinkle with the crispy prosciutto.
The salad can be refrigerated for a day before serving. Just leave off the prosciutto until last minute.