- Preheat the grill. On the hob, heat the sardines over a medium heat, adding the chilli sauce, chilli flakes, garlic and half the lime juice, gently stirring through.
- Arrange the tortilla chips on a baking tray, making a slight dent in the middle. Spoon over the sardine mixture, then top with cheese.
- Grill until the cheese is bubbling and golden.
- Serve with the sour cream, red onion, avocado, coriander and a squeeze of lime juice.