Preheat your oven to 400°F (200°C). In a large bowl, whisk together the miso paste, honey, grapeseed oil, white wine vinegar, and lime juice. Season with Kosher salt and freshly cracked black pepper to taste. Add the rainbow baby carrots to the bowl and toss gently to coat them evenly.
Arrange the glazed carrots in a single layer on a baking sheet lined with parchment paper or aluminum foil. Roast the carrots in the preheated oven for 20-25 minutes, or until they are tender and caramelized, tossing them halfway through for even roasting.
Remove the roasted carrots from the oven and transfer them to a serving dish. Garnish with toasted sesame seeds, if desired.