Peppercorn studded burger, tricolour slaw & sweet potato wedges

Ingredients

• 500 g Irish minced beef rump, blade or chuck steak (with at least 20% fat content)
• 1 garlic clove, crushed
• 1 tbsp tomato puree
• 2 tsp Worcestershire sauce
• 1 tbsp chopped fresh coriander
• 1 tbsp black peppercorns, cracked
• 4 burger buns, halved
• 225 g white cabbage, thinly sliced
• 100 g carrots, grated
• finely grated rind 1 lime
• juice of 3 limes
• 2 tbsp white wine vinegar
• 1 tbsp caster sugar
• 1 tsp salt
• handful fresh coriander leaves
• 500 g orange fleshed sweet potatoes
• 1 tbsp olive oil
• sea salt and freshly-ground black pepper
• salad leaves
• caramelised onion relish or tomato chutney