4-6 Italian Sausages or 2 kielbasa style sausages, cut into 6 inch lengths
2 sweet onions, cut into wide petals
1 bunch kale, ribs removed and cut into 1 inch wide ribbons
1 tbsp fennel seed
1/2 tsp chili flakes (optional)
1/4 cup whole grain mustard
1/4 cup olive oil