My neighbor brought this to the potluck and the tray was licked clean

2 cups packed light brown sugar

1 cup ketchup

1/4 cup yellow mustard

Directions

Line a large rimmed baking sheet with aluminum foil and set aside for later. This will make cleanup easy and give you the surface you need for caramelizing the kielbasa under the broiler.

Slice the kielbasa into 1/2-inch coins. Aim for even slices so they cook and glaze at the same rate. Place the sliced kielbasa into a large slow cooker (5- to 6-quart works well).

In a medium bowl, whisk together the brown sugar, ketchup, and yellow mustard until the mixture is completely smooth and no dry sugar remains. The sauce should be thick, glossy, and pourable.