Mix all the paste ingredients together well
Combine the rhubarb, carrots and spring onions and add the paste. Mix really well, massaging the paste into the vegetables. Set aside for a couple of hours
Pack the kimchi into sterilised Kilner jars and press down really firmly to make sure the liquid covers the vegetables
Seal the jars and place onto a plate or tray in a dark place like a cupboard and leave to ferment, checking daily and pressing the vegetables down to ensure they’re submerged in liquid at all times
Taste the kimchi as you go - you’ll find it gets fizzier and more sour as it ferments. Once you’re happy with the flavour (probably somewhere around 5-7 days) pop it into the fridge to stop the fermentation process