Wash the rice and dhal separately until the water is clear.
Place the rice in a bowl with the fenugreek seed and cover with water, leave to soak for 4-6 hours.
Put the dhal into a separate bowl, cover it with water and leave to soak for the same amount of time.
Drain the dhal and grind in a blender, adding small amounts of water at a time, until it is a fine paste. Set aside.
Drain and grind the rice with a cup of water until it is a coarse paste.
Combine both the dhal and rice in a large bowl, adding a 1/2 cup of water to make a batter that is not too thick or thin.
To ferment, place the bowl in a warm place (I used our hot water cupboard) overnight.
Next morning, give the batter a quick mix, then spoon evenly into the idli moulds. I have purchased a stainless steel idli stand with four plates.
In an electric pressure cooker, preheat 1/2 cup water in saute mode, before adding in the idle stand, close the lid but keep the vent open. Use manual mode to steam for 12 mins.
Remove from the pressure cooker, and wait 5 mins before using a sharp knife to scoop out the idlis.
Serve immediately with chutney of your choice and a sambar.