Pat the tofu really dry with kitchen paper, then tip the five-spice onto a plate with lots of seasoning and roll the tofu pieces in it, pressing to stick.
Heat 1 tsp of the vegetable oil in a non-stick frying pan and fry the tofu pieces for 4-5 minutes, turning, until all of the sides are crispy and charred. Remove onto a plate. Add the remaining tsp of oil to the pan along with the broccoli florets and 100ml of water. Cook for 5 minutes, stirring, until all of the water has evaporated, then cook the broccoli for another 5 minutes until it starts to caramelise. Return the tofu to the pan along with the ginger and garlic, and cook for a minute.
Whisk together the cornflour, soy sauce, sriracha, rice vinegar, sugar and 100ml of water, and add to the pan along with the noodles. Cook for 2-3 minutes, tossing, until the noodles have heated through and the sauce has reduced.
Divide between two bowls and scatter over the spring onions.