2 large cooking apples, peeled, cored and roughly chopped (approx 250g/9oz prepared weight)
600g/1lb 5oz raw beetroot
2 unwaxed lemons, finely grated zest only
100ml/3½fl oz lemon juice (about 2–3 lemons)
1 red onion, finely chopped
2 tbsp capers or caper berries, roughly chopped
few grinds black pepper
2 tsp fennel seeds
large pinch of sea salt
200g/7oz granulated sugar
150ml/¼ pint cider vinegar