Steak and bacon jam sandwiches

Name: Steak and bacon jam sandwiches
Ingredients: 2 thick sirloin steaks 4cm/1½in thick; 2 tbsp olive oil; 1 tbsp salt; 1 tsp chilli flakes; 1 tsp paprika; 1 tsp crushed peppercorns; 1 large ciabatta loaf; 2 tbsp Dijon mustard; 2 tbsp mayonnaise; 200g/7oz garden salad leaves (watercress or rocket work well); 200g/7oz pancetta; 200g/7oz bacon lardons; 2 white onions, chopped; 6 garlic cloves, finely chopped; 2 red chillies, chopped; 2 tbsp bourbon whiskey; 2 tbsp maple syrup; 200g/7oz soft dark brown sugar; freshly ground black pepper