1kg/2.2lb Bramley apples, peeled, cored, cut into large chunks
300驳/10陆辞锄 blackberries
300驳/10陆辞锄 onions, peeled, thinly sliced
150ml/5fl oz balsamic vinegar
freshly ground black pepper
2 tsp ground cinnamon
275g/10oz granulated sugar