Preheat the oven to 425 degrees.
Cut the vegetables into uniform sizes; separate the broccoli and the Brussel sprouts from the rest of the vegetables.
Place the tomatoes, onion, and asparagus mixed on a baking sheet lined with a silicone baking mat or parchment paper.
Do the same with the broccoli and Brussel Sprouts.
Combine all the spices in a bowl and sprinkle generously over the two pans with the vegetables.
Roast the broccoli and Brussel Sprouts for 20 minutes.
Cook the baking sheet with the asparagus, tomatoes, and onions for 15 minutes.
In the meantime, bring 6 cups of water and 1 Tablespoon of salt to a boil in a pot.
Add 1 ½ cup dry orzo, and stir. Reduce heat to medium-low and cook for 7 minutes.
Remove from the heat, and rinse in a colander by running cold water through it. Make sure to move the orzo around so all the pasta cools.
Whisk the dressing ingredients together and set aside.
Once the vegetables are cool, place the cooled orzo in a large bowl
Pour the dressing into the pasta and stir.
Then, add the cooled roasted vegetable, toss and serve.