In a large skillet over medium-high heat, lightly brown the kielbasa until golden, about 5 minutes. Transfer to a plate. Melt the butter in the skillet. Stir in the onion and thyme, and stir briefly to coat the onion with butter. Cook onion, without stirring, until dark brown, about 5 minutes. Add a pinch of salt and cook on low heat until very soft and caramelized, 20 to 30 minutes. Stir in 2 tablespoons water and scrape up any browned bits from the bottom of the pan. Transfer onion to a bowl.
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