Preheat the oven to 450ºF. Line a baking sheet pan with parchment paper.
Season the cauliflower florets with salt, and drizzle the oil. Toss to coat well.
Place the cauliflower on a prepared sheet pan. Baken in the oven for 10 minutes.
Meantime, make the bbq sauce. In a saucepan, combine ketchup, soy sauce, Worcestershire sauce, apple cider vinegar, brown sugar, grated garlic, and ginger.
Stir to combine, simmer for 2 minutes or until the sugar dissolved and the sauce thickened for a bit.
Remove the cauliflower from the oven. Drizzle half of the bbq sauce, and toss to coat well. Place the cauliflower back in the oven for 20 minutes or until the sides browned.
When the cauliflower is done roasting, pour the rest of the bbq sauce on top. Sprinkle with green onions and sesame seeds. Serve warm.