Heat oven to 200°C
Bring a large saucepan of water to a boil. Season with salt.
Wash the carrots and cut off the ends on both sides. Cut in half lengthways. If the carrots are very large and thick, cut them in half again lengthways to make quarters. It's important that all the carrots are about the same size so they cook evenly.
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 the carrots and place in the roasting tin. Toss in butter and season with salt (salt is needed to balance the sweet carrots). Add the Umami Bomb sauce and coat the 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. Taste and season with salt and pepper if needed.
To finish garnish with sesame seeds and spring onion.