Braised Kale with Pancetta

Bahan-bahan (4 porsi)

• 2 ounces pancetta (diced)
• 1 medium onion (chopped)
• 2 cloves garlic (minced)
• ½ tsp red pepper flakes
• 1 cup reduced sodium chicken broth
• 1 tablespoon red wine vinegar
• 3 bunch es flat kale (stemmed and torn (14 oz/17 cups total))