Homemade tomato chutney

Name: Homemade tomato chutney
Prep time: 30 min
Cook time: 1 h 10 min
Total time: 1 h 40 min
Cuisine: British
Ingredients: 500g red onion, finely sliced; 1kg tomato, chopped; 4 garlic cloves, sliced; 1 red chilli, chopped (optional); 4cm piece ginger, peeled and chopped; 250g brown sugar; 150ml red wine vinegar; 5 cardamom seeds; ½ tsp paprika