In a bowl or pan, soak the vermicelli rice noodles in boiling water for 3 minutes or according to package instructions. Don't heat over a flame – simply soak in the water. After 3 minutes, or once they are soft, drain well and set aside (I mix through a dash of sesame oil to prevent sticking).
Meanwhile, heat one tablespoon of sesame oil in a large pan and add the finely chopped onion. Soften for 3-4 minutes, before adding the diced peppers, garlic, ginger, and chilli. Soften these for a further 2-3 minutes, then add the finely chopped mushrooms and sweetcorn. Cook for 3-4 minutes or until the mushrooms have started to soften.
Next, stir in the plant-based mince and cook for 5 minutes. If using frozen, it may need a few minutes longer to heat through.
Once the mince has cooked through, add the tamari/soy sauce, spring onions, lime zest, lime juice, chopped coriander, and the other tablespoon of sesame oil. If you want the rolls to look more decorative, save most of the coriander leaves and just add the chopped stems to the pan. Cook everything for a further two minutes, then turn off the heat and allow the mix to cool (approx. 10 minutes).
While the mix is cooling, stir in the vermicelli noodles. Top tip: Cut the noodles into the pan using a pair of scissors, grabbing a small handful of noodles at a time. Chop them as short as you like – the shorter they are, the easier it will be to roll the filling in the rice paper.
At this point, you can adjust the seasoning to taste. You may want to add a pinch of salt, extra tamari/soy sauce, sesame oil, lime juice, or lime zest. While the mix is cooling, you can get ready to roll. You'll want a clean chopping board or surface and a bowl filled with warm water (not boiling).
Once the filling is cool enough to work with, take a sheet of rice paper and submerge it in the water for 5 seconds or until it starts to soften. If you can't fit the entire sheet in the bowl, just do one side and then rotate. The rice paper should be slightly soft but still holding its shape. Place it on the board or surface with the smooth side down.
Place two coriander leaves in the centre of the rice paper, followed by a heaped tablespoon of the filling. Make sure this is positioned neatly in the middle, with a clear gap to the edges of the rice paper (see photos).
Fold the bottom of the rice paper up and over the mix, then press it down to seal. Next, fold the left and right sides of the rice paper in towards the middle.
Finally, roll the whole lot over towards the top edge, keeping the sides tucked in as you do so. Press down slightly to make it stick, although the rice paper should do a good job of sealing itself.
Repeat this process until you have used up all of the mixture. If it's getting difficult to make your rice paper rolls stick together, it's probably time to change the water. It can take some practice to get into the swing of things, but keep at it and you'll soon be a rice paper pro.
Serve the rice paper rolls cold with peanut dipping sauce.