Black-Bean Soup

INGREDIENTS

• 2 tablespoons canola oil
• 1 slice ham, 1/2 inch thick
• 1 medium red onion (5 ounces), diced
• 1 jalapeno chile, seeded if less heat is desired, and finely chopped
• 4 cloves garlic, minced
• 1/2 teaspoon ground cumin
• 1/2 teaspoon dried oregano
• 3 cans black beans (15 ounces each), drained and rinsed
• Salt and pepper, to taste
• 1/2 cup lightly packed cilantro leaves, for garnish
• Lime wedges (optional), for serving
• Plain yogurt (optional), for garnish