Caul-do Verde (Portuguese Caldo Verde with Cauliflower)

INGREDIENTS

• 2 tablespoons olive oil (plus extra for roasting)
• 1/2 teaspoon red pepper flakes
• 8 cups chicken stock
• 1 bunch mustard greens, shredded
• 1/2 to 1 teaspoon ground cumin, or to taste
• 1/4 cup parsley, finely chopped
• 1/4 cup cilantro, finely chopped
• 1/2 pound smoked turkey kielbasa, sliced (Wellshire Farms brand is particularly good)
• 2 pounds cauliflower florets (from 1 medium head)
• 1 Spanish onion, chopped
• 4 large garlic cloves, minced
• 1/2 tablespoon smoked paprika
• Salt and pepper
• 1/2 lemon, juiced