Tuna with peppery tomatoes & potatoes

Name: Tuna with peppery tomatoes & potatoes
Cook time: 25 min
Total time: 25 min
Cuisine: Australian
Ingredients: 4 tuna steaks; 1 tbsp olive oil; 3 garlic cloves crushed; few thyme sprigs; 500g bag new potato sliced about 1cm thick; 2 red peppers cut into large chunks; 1 red onion cut into eighths; 1 green chilli deseeded and chopped; 400g can cherry tomato