Soft Tacos with Black Bean Mole and Flank Steak

Ingredients

• 1 tbsp olive oil
• 3 flank steaks (about 200gm each), at room temperature
• 8 white corn tacos
• coarsely crumbled feta, coriander sprigs and lime wedges
• Black bean mole
• 1½ tbsp olive oil
• ½ Spanish onion, finely chopped
• ½ carrot, finely grated
• 1 garlic clove, finely chopped
• 1 tsp each ground cumin, ground coriander and paprika
• 1 cinnamon quill
• 1 tsp finely chopped chipotle chillies in adobo (see note)
• 400 gm canned black beans, drained and rinsed
• 250 gm canned cherry tomatoes
• 1 fresh bay leaf
• 1 tbsp Dutch-process cocoa