Blackened barbecued pork fillets

INGREDIENTS

• ½ teaspoon cumin seeds
• 1 teaspoon fennel seeds
• 2 cloves
• 1 heaped tablespoon sweet smoked paprika
• zest and juice of 1 orange
• 1 small bunch of fresh thyme, leaves picked and very finely chopped
• 4 cloves of garlic, peeled and very finely chopped
• 150 ml Heinz organic tomato ketchup
• 6 tablespoons balsamic vinegar
• 4 x 400 g higher-welfare pork fillets
• sea salt
• freshly ground black pepper
• 1 handful of fresh coriander, leaves picked and chopped, optional
• juice of optional 1 lemon