Pour carrots and their balsamic glaze onto the roasting pan and make sure they are spread out evenly in a single layer.
Roast the carrots in the oven for about 15 minutes.
Remove the roasting pan from the oven. Toss carrots with chopped pecans, drizzle with another light layer of balsamic vinegar (about 1/2 tablespoon). Stir the carrots together once more, making sure the carrots and pecans are evenly covered with balsamic.
Add a light sprinkle of sea salt and black pepper to taste.
Put the carrots back into the oven to roast for five minutes. Once done, top with fennel fronds if you like. Let cool slightly, and enjoy!