In a wok bring to high heat, add in oil and cook prawns. Set them to the side.
Place in ginger and garlic and add broccoli and sauces, dark soy sauce, oyster sauce, and brown sugar. Cook through. Place in udon noodles. Cook until noodles separate.
Add cooked prawns back in, black pepper and sichuan pepper and cook for 2-3 minutes, tossing.