Seared tuna with roasted tomatoes

• Ingredients
• 1 clove garlic, finely chopped
• rind and juice of 1 lime
• 5tbsp olive oil, plus extra for greasing
• 3tbsp chopped fresh rosemary
• 4 fresh tuna steaks
• 6 plum tomatoes, halved lengthways 
• 1 red onion, thinly sliced
• seasoning

Mix together the garlic, lime rind and half the juice, 2 tbsp of the oil and 1 tbsp of rosemary in a large dish. Add the tuna and coat with the marinade - marinate for 30 minutes.Preheat oven to gas 7, 220ºC, fan 200ºC. Place the tomatoes and onion in a shallow oven proof dish with the remaining rosemary. Drizzle with the remaining oil and season. Roast in the oven for 15 to 20 minutes, until tender and lightly browned.Lightly oil a ridged cast iron grill pan or large frying pan. Heat the pan and cook the tuna steaks for 5 to 6 minutes turning once. Serve with the tomatoes and onion and drizzle the remaining lime juice over the top.

Source : https://realfood.tesco.com/recipes/seared-tuna-with-roasted-plum-tomatoes.html