Poc chuc (marinated pork)

Ingredients

• Grated zest and juice of 1 grapefruit
• Grated zest and juice of 1 orange
• Juice of 1 lime
• 1 tablespoon (15 ml) chili powder
• 1 teaspoon (5 ml) salt
• 1/2 teaspoon (2.5 ml) ground coriander
• 1/2 teaspoon (2.5 ml) ground cinnamon
• 1 lb (454 g) pork leg cutlets
• 2 tablespoons (30 ml) olive oil
• 2 red onions, sliced
• 1/4 cup (60 ml) red wine vinegar
• 1 tablespoon (15 ml) sugar
• Salt and pepper
• 1 can (540 ml/19 oz) black beans, rinsed and drained
• 1 tablespoon (15 ml) lime juice
• 1 tablespoon (15 ml) olive oil
• 8 small tortillas
• 2 tomatoes, sliced
• 1/2 cup (125 ml) sour cream
• Cilantro