Melt butter in a large skillet over medium heat.
Add carrots, brown sugar, salt, and water/broth. Stir to coat.
Bring to a simmer, cover, and cook 8-10 minutes until carrots are almost tender.
Remove lid, raise heat a little, and cook 4-6 more minutes, stirring often, until the liquid reduces to a shiny glaze and carrots are perfectly tender.
Hit with black pepper and serve hot.