Heat a skillet over medium heat and add a generous pat of butter. Add the sliced onions with a pinch of salt and cook low and slow, stirring occasionally, until deeply golden and caramelized about 20 minutes. Don't rush this step.
2
While the onions cook, preheat your grill or grill pan to medium-high heat. Score the kielbasa links with a few shallow diagonal cuts on each side to help them cook evenly and get great grill marks.
3
Grill the kielbasa for about 4–5 minutes per side until nicely charred and heated through.
4
Toast the hoagie rolls on the grill for 1–2 minutes until lightly golden.
5
Spread whole grain mustard generously on the toasted rolls. Nestle a grilled kielbasa link inside each roll and top with a heap of caramelized onions. Serve immediately.
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