Preparation and Cooking

• Preheat the oven to 400°F. Line a half sheet pan with foil.
• In a medium bowl, toss the cabbage, onion, 2 tablespoons oil, ¾ teaspoon salt, and ½ teaspoon pepper until well combined. Place on the prepared baking sheet.
• In the same bowl, toss the frozen pierogi with 2 tablespoons oil, ½ teaspoon salt, and ¼ teaspoon pepper until the pierogi are well coated. Arrange on the prepared baking sheet along with the sliced kielbasa.
• Bake for 20 minutes. Stir the cabbage and flip the pierogi. Bake until the cabbage is golden and the kielbasa and pierogi are crispy, 20 to 30 minutes more.
• Meanwhile, in a medium bowl or measuring cup, whisk together the vinegar, mustard, honey, garlic, remaining ¼ teaspoon salt, and ¼ teaspoon pepper. Whisk in the remaining ¼ cup oil until well combined.
• Drizzle half of the dressing over the cabbage, pierogi, and kielbasa, tossing to combine. Top with dill or parsley and serve hot with the remaining dressing and sour cream.