Vegetable feijoada

Ingredients

• 2 whole dried red peppers or 1/4 teaspoon. crushed red pepper flakes
• 1 teaspoon. ground cumin
• 2 teaspoons. dried leaf thyme or 1 tsp. ground thyme
• 2 medium sweet potatoes, peeled, sliced lengthwise into quarters and then into 1/4-inch thick slices
• 1 large or 2 medium leeks (white parts only), rinsed and sliced lengthwise info 1/2-inch thick slices
• 1 red bell pepper, seeded and sliced lengthwise into 1/2-inch wide slices
• 1 yellow bell pepper, seeded and sliced lengthwise into 1/2-inch wide slices
• 1 medium yellow onion, peeled and sliced lengthwise into 1/2-inch thick slices
• 2 tablsespoons. fresh-squeezed lime juice
• 1 large tomato, sliced into 1/4-inch thick slices
• 2 16-ounces cans black beans
• Thin lime or orange slices, and cilantro sprigs for garnish
• Cooked rice (optional)