Bring a 15cm or 6" pan of water to a boil, add the salt and throw in the dried chillies and potatoes and boil for 10 minutes to soften.
Peel and slice the red onion into 2-3mm (⅛") thick half-moon shapes.
Roughly chop the tomato into a 1-1½cm (½") dice.
Peel the garlic cloves and slice them as finely as you can.
Heat the oil in a 28cm or 11" frying pan or skillet and add the seeds and asafoetida.
When your seeds start to pop and crackle, add in the onion and curry leaves, then cook for 2-3 minutes.
Drain your potatoes, making sure you reserve the chilli peppers.
Lightly crush your potatoes; you do not want them squished, just broken open a little.
I use the bottom of a glass to do this.
Chop as much of the chilli as you want to add.
I usually add all of them.
Add the tomatoes and stir until they start to break down, which will take a few minutes.
Add the turmeric to the onions, followed by the chilli, garlic, and crushed potatoes, then crush the fenugreek leaves over the dish with the palms of your hands and toss to coat.
Transfer to the oven and roast at 200°C or 400°F for 30-35 minutes.