Lamb and aubergine traybake

Ingredients

• 2 aubergines, cut into rounds
• 1 red pepper, deseeded and cut into thick strips, lengthways
• 1 red onion, cut into wedges
• 8 new potatoes, halved
• 2 tbsp olive oil
• 2 tsp red wine vinegar
• 2 garlic cloves, thinly sliced
• 1 tsp dried oregano
• a few sprigs of rosemary
• 2 lamb leg steaks
• handful of cherry tomatoes
• 150g feta cheese, cut into chunks
• small bunch of mint, leaves only
• flaked sea salt
• freshly ground black pepper