Spiced duck & date tagine

Name: Spiced duck & date tagine
Prep time: 15 min
Cook time: 5 h 20 min
Total time: 5 h 35 min
Cuisine: Moroccan
Ingredients: 2 tsp sunflower oil; 6 duck leg , skin removed; 1 large onion; 2 garlic cloves; 1 red chilli , deseeded; thumb-sized piece of ginger , peeled; 1 tbsp cumin; 1 tbsp coriander; 1 tbsp cinnamon; 1 tsp ground ginger; 2 preserved lemons , halved, pulp and pith scooped out and discarded; 200g dates; 400ml passata; 100g blanched almonds , very roughly chopped; mint leaves, to serve; couscous , to serve