In a large pan, put 1.5 litres of water and add the noodles - breaking them into shorter lengths (a few inches - you don't want to be messing around at work, bighting off lengths of noodles).
Put the lid on, bring it to the boil, lower the heat so that it simmers and leave it to get on with it.
Now for the lotus root. This is not a particularly familiar vegetable in the west so I'll go into it in a bit more detail.
|This is lotus root as it comes out of the pond
(or bag from the Chinese supermarket)
Unless you can get hold of the actual fresh root, you will find it wrapped in air/water-tight bags, around 40-50cm long. These usually have three or four joints in them.
Take it out of the bag and give it a quick rinse under the tap.
|Remove the joints, leaving clean
ends to each section
Then chop out the joints like so, leaving clean ends.
Next, remove the skin, using a potato peeler.
|Use a potato peeler to remove the skin
The root is quite brittle compared to potato so angle the blade at about 45 degrees to make it cut better.
Using a reasonable sharp knife, chop the root up into sections that are about 4-7mm thick.
|Slice them around 4 to 7mm thick
Warm up a deep oil fryer to 180 Celsius and drop in the sections, one at a time. If you put them in all at once, they will stick together.
|Deep-fry until they are brown
You will probably have to do this in two or so batches - they do bubble a lot because they have a lot of water in them.
Fry them until they are brown.
Once they are ready, drain them and put them on some kitchen towel to soak up any excess oil.
|Drain them and put them on kitchen paper.
Put them to one side but keep them warm.
Chop your chillies into pieces roughly 5mm long and the spring onions into pieces roughly 1cm long - including the green bits.
|Cover the deep-fried root evenly in the sauce
In another large saucepan, put a couple of tablespoons of peanut oil and start heating it. Add the black and white sesame seeds and heat over a gentle heat until the white sesame seeds start to brown.
Add the chopped veg and the garlic and ginger and stir-fry them.
Add the Hoi Sin sauce, a couple of tbsp of soy sauce and a couple of squirts of the dark sesame oil. Keep on stirring.
Add the deep-fried lotus root and mix it in well, on the heat so that it is covered in the sauce.
Drain the noodles when they have finished cooking and divide them up into the three lunch boxes.
|Stir-Fry Lotus root, ready to eat
On top of them, divide up the stir-fry lotus root with sauce, making sure that the root, the veg and the sauce are evenly distributed between the boxes
Finish off by drizzling a few drops of oil and some soy sauce over your meal.