Preheat your oven to 450 degrees f. and line a large baking sheet with parchment paper.
Drizzle with one Tablespoon of sesame oil and brush it onto the entire surface of your sheet pan.
Cut the cauliflower into 1-inch pieces and spread onto your prepared sheet pan (I like to cut them a bit bigger since they'll continue to break while stirring).
Roast in your preheated oven for 15 minutes.
Meanwhile, in a medium bowl whisk the arrowroot/cornstarch with 2-3 Tablespoons of water until completely smooth.
Add in all of the remaining ingredients, except for the sesame seeds, and whisk until everything is well combined.
Once the florets are 15 minutes into baking, carefully remove from the oven.
Pour your sticky sauce over the cauliflower and stir to coat, then arrange them evenly without overlapping.
Continue to bake for 10-12 minutes, or until golden and sticky. You may want to give them another stir halfway through baking time, to coat with the sauce.
Sprinkle with sesame seeds.
Enjoy them while they’re hot!