Chicken tagine with orange and fennel

Name: Chicken tagine with orange and fennel
Ingredients: 4 tbsp olive oil; 4 large chicken legs; 3 large onions (about 600g/1lb 5oz), sliced; 2 large fennel bulbs (about 600g/1lb 5oz), stalks and fronds discarded, sliced; 100g/3½oz raisins; 1 large orange, zest and juice; 3 garlic cloves, crushed; 1 tsp ground coriander; 1 tsp ground turmeric; 1 tsp ground ginger; 1 tsp salt; ½ tsp ground cumin; 200ml/7fl oz vegetable or chicken stock; handful mint leaves, chopped; 1 orange, peel only, cut into very thin strips