Slice the carrots into ⅛ to ¼-inch discs or diagonally. Try to cut the pieces so they are about the same size as each other so they cook evenly.
Melt the butter in a skillet over medium-high heat and then add the carrots. Toss to combine and reduce the heat to medium. Sprinkle the salt over carrots and toss again. Sauté for 3-4 minutes.
Add the sugar and white pepper (if using) and toss to combine. Add the stock. Cover the skillet and cook for another 3 minutes.
Uncover the skillet and increase heat to medium-high. Toss the carrots once or twice to keep them moving, and cook away most of the liquid. Turn off the heat and taste. Add more salt and sugar to taste.
