Arrange a rack in the upper third of the oven and heat the oven to 375°F.
While the oven is heating, make the sauce. In a bowl or measuring cup, whisk together the gochujang paste, oil, syrup, salt, and pepper. Salt to taste and set aside.
To roast the carrots, on a rimmed sheet pan, toss the carrots with the oil and season with salt and pepper. Spread out the carrots and roast until the tip of a sharp knife easily pierces the center, about 20 minutes, depending on the size of the carrots. If they are not tender, roast for another 10 minutes, or more.
To serve, drizzle the gochujang sauce over the carrots and use tongs to toss the carrots, coating them completely. Transfer to a warmed serving platter, garnish with fresh herbs and toasted pecans, and serve immediately.
