Toast the sesame seeds in a wide frying pan over medium heat until deeply golden and aromatic, then tip out and reserve
Return the pan to high heat, add oil and broccoli with a pinch of salt, leave still until well charred then stir and toss until more charred and just tender
Remove the broccoli to a bowl and add soy sauce, vinegar, sesame oil and toasted sesame seeds, stir to combine and season with salt if needed
Whisk together the chilli oil solids, peanut butter, miso, mirin, soy sauce and vinegar until smooth, loosen with hot water if needed
Cook the udon in well-salted boiling water until just tender, drain and reserve some cooking water
Add the hot noodles to the sauce and toss to coat, loosening with more water if needed
Divide noodles between bowls and top with charred broccoli, protein of choice, eggs and spring onions
