Preheat oven to 400 degrees and line baking sheet(s) with parchment paper.
Rinse, trim and cut Brussels Sprouts in half. In a large bowl toss/stir Brussels Sprouts with olive and sesame oils. Season with salt and toss/stir to coat evenly.
Pour sprouts onto baking sheet(s) making sure not to crowd the pans (otherwise they will get steamed instead of getting crisp). Roast for 25-30 minutes, stirring every 5-10 minutes so that they are evenly browned.
While the sprouts are roasting in the oven, combine rice vinegar with cornstarch in a saucepan, add Harissa, maple syrup and sesame oil. Stir to combine and turn heat to medium-high. Let it come to a boil, thicken and reduce slightly, stirring frequently.
Remove the roasted sprouts from the oven, transfer them to a serving bowl and pour the Harissa sauce on top. Stir to coat evenly and serve!