Cook the prawn tempura
Cook the frozen prawn tempura according to the packet instructions, either in the air fryer or oven, until golden and crispy.
Cook the udon
Bring a pot of water to a boil and cook the udon according to the packet instructions. Once cooked, drain and set aside.
Make the broth
While the udon cooks, add the water, dashi powder, light soy sauce, mirin and salt to a separate pot or ddukbaegi (Korean earthenware pot, like I'm using in my video).
Bring to a gentle boil, then taste and adjust the seasoning to your liking.
Cook the narutomaki
Add the slices of narutomaki to the broth and simmer for around 2 minutes, just to warm them through.
Assemble & serve
Turn off the heat and add the cooked udon to a serving bowl.
If you're using a ddukbaegi like I am, you can add the udon straight into the pot.
Top with the crispy prawn tempura, narutomaki, spring onions and a sprinkle of shichimi togarashi, your soy-marinated egg and enjoy!