Preheat your oven to 425 degrees f and line a large sheet pan with parchment paper.
In a medium bowl, whisk the first 9 ingredients together well to create your sauce.
Add your cauliflower florets to a large bowl.
Drizzle the sauce over your florets and thoroughly toss to coat each piece.
Spread the coated florets onto your prepared sheet pan.
Roast for 15 minutes, or until the florets start to become golden.
Carefully remove the pan from the oven, sprinkle the florets with the arrowroot/flour, or cornstarch, then toss and spread evenly onto the pan again.
Return to the oven and continue to roast for 10-12 minutes until nicely golden brown and starting to crisp up.
Sprinkle your roasted cauliflower with sesame seeds and green onions then enjoy!