Lemon chicken with olives

Ingredients ( 8 servings): 1.2kg chicken thigh fillets, trimmed 2 tablespoons olive oil 1 brown onion, halved, roughly chopped 2 garlic cloves, sliced 400g can diced tomatoes 1 small lemon, sliced 1 tablespoon brown sugar 2 teaspoons fresh oregano leaves 1 cup (180g) pitted kalamata olives   Method: Season chicken with salt and pepper. Heat…