Heat the oven to 400 degrees, and lay 6 large squares of aluminum foil out on a flat surface.
In a bowl, combine the asparagus, cauliflower, broccoli, and onion.
Drizzle the vegetables with a tablespoon of olive oil, and season with salt and pepper to taste.
Season the steak pieces with rosemary, basil, thyme, and salt and pepper to taste.
Add 1 tbsp of olive oil to a skillet over medium-high heat, and saute the steak until seared well. Remove, and set aside.
Place a serving of vegetables onto each of the 6 pieces of aluminum foil, and top with a serving of the steak.
Fold the edges of the foil squares up to form a closed packet.
Add the packets to a baking sheet, and bake for 15-20 minutes, or until the vegetables are tender.
