Bring 1L (4 cups) water to the boil in a medium saucepan for the noodles. Thickly slice the pak choy stems, leaving the leaves whole. Pick the coriander leaves, discarding the stems. Halve the tofu pieces on an angle.
Step 2 — Warm tofu
Heat a drizzle of vegetable oil in a small frypan over medium heat. Cook the tofu for 2 mins each side or until golden and warmed through. Remove the pan from the heat.
Step 3 — Cook noodles
Meanwhile, cook the noodles in the pan of boiling water for 5 mins.
Step 4 — Add pak choy
Add the pak choy, pho seasoning and 1 tsp soy sauce to the noodles. Bring to the boil and cook for 2 mins or until the noodles and pak choy are tender. Remove the pan from the heat. Taste, then season with salt and pepper.
Step 5 — Serve up
Divide the noodles, pak choy and soup among bowls. Top with the tofu, coriander leaves and fried shallots and enjoy!
Step 6 — Make it spicy
Chilli lovers, go wild and scatter over chopped bird's eye chilli to serve.