Pork & chickpea curry

Name: Pork & chickpea curry
Cook time: 2 h 15 min
Total time: 2 h 15 min
Cuisine: Indian
Ingredients: 1 ½ tsp black peppercorn; 2 tsp fennel seed; 1 tsp coriander seed; 2 tsp cumin seed; 1 tsp chilli powder; ½ tsp turmeric; 2 garlic bulbs, peeled, cloves separated; 100ml red wine vinegar; 1.5kg/3lb 5oz pork shoulder , cut into 2.5cm pieces; 50ml vegetable oil; 3 large red onions , finely chopped; 2 red peppers , deseeded and roughly chopped; 400g can chopped tomato; 2 tsp dark muscovado sugar; 2 x 400g tins chickpeas , drained and rinsed; 450ml chicken stock; rice , to serve