Cook the rice in a rice cooker with the broth.
Set up a dredging station: Drain the liquid from a can of chickpeas into a bowl. Reserve the chickpeas for another recipe. Mix 1 cup (120 g) of the cornstarch, flour, salt and pepper in a second bowl. Break any florets larger than 2 to 3 inches (5 to 7 cm) in half.
Put a very large, deep pan over medium-high heat. Add a ½ inch (13 mm) of oil. Heat the oil to 365°F (185°C), about 2 to 3 minutes. Test it by dropping a pinch of flour in the oil. When it bubbles, the oil is ready.
While the oil heats, prepare the first batch of cauliflower. Coat several pieces in the flour and then dredge them in aquafaba. Let some of the excess aquafaba drip away and add a second coat of flour.
Fry the cauliflower in two batches until golden and crispy, turning as needed, for about 4 to 5 minutes. Line a plate with paper towels, and then batter the next batch. Place the fried cauliflower on paper towels to drain any excess oil. While the last batch of cauliflower is frying, mince the garlic.
Heat 1 tablespoon (15 ml) of oil in a small saucepan over medium-high for about 30 seconds. Add the garlic, ginger and chili flakes. Cook until fragrant, about 1 minute. Add the orange juice, tamari, vinegar, agave and sriracha. Reduce the heat to medium-low.
Mix 1 tablespoon (8 g) of cornstarch with 2 tablespoons (30 ml) of water. Stir the slurry into the sauce. Turn off the heat when the sauce looks syrupy, about 2 minutes. Slice the green onions while the sauce is cooking.
Fluff the rice, toss the fried cauliflower in the sauce and serve immediately. Divide the rice into bowls and top with cauliflower, green onions and sesame seeds.