Bring a large saucepan of water to a boil. Season with salt.
Wash carrots and trim ends off both sides. Cut in half lengthways. If carrots are very large and thick cut them in half a second time lengthways so you have quarters. It’s important all carrot pieces are approximately the same size for even cooking.
Drop carrots into the salted water and set the timer to cook for 8 minutes
Combine all umami bomb sauce ingredients.
Add 1 tbsp butter to an oven roasting tray and place in the oven for 1 minute to melt the butter.
Drain carrots and add to the roasting tin. Roll around in the butter and season with salt (salt is needed to balance the sweet carrots in addition to the sauce). Add umami bomb sauce and coat carrots evenly.
Return the tray to the oven and roast for 20 – 25 minutes or until sticky and caramelized.
Transfer carrots to a serving plate.
Add another tablespoon of butter to the toasting tray, let it melt, and scrape up any sticky miso sauce from the pan. Pour the butter over the carrots.
To finish garnish with sesame seeds and spring onion.