Preheat the oven to 425°F and line a sheet pan with aluminum foil or parchment paper, or spray with non-stick cooking spray.
In a large bowl, combine the cauliflower, lime juice, olive oil, chili powder, sriracha, garlic, cumin, and salt. Stir until all of the cauliflower pieces are evenly coated. Transfer to the baking sheet in a single layer and roast for about 30 minutes or until nicely caramelized.
Toast each tortilla over an open flame or in the toaster oven. Warm the refried black beans over the stove or in the microwave and then spread a spoonful or two on each tortilla. Top with a few scoops of roasted cauliflower, avocado, cabbage, Mango Salsa and cilantro. Drizzle with more Sriracha if desired.