Step 1

Preheat the oven to 220°C (200°C fan-forced).

Step 2

Heat oil in a large frying pan over medium heat. Cook onion and garlic, stirring, for about 5 minutes or until soft. Increase heat to high; add mince; cook, stirring, for about 5 minutes, breaking up lumps, or until browned lightly. Add spices; cook, stirring, for 1 minute or until fragrant. Sprinkle in flour; cook, stirring, for 1 minute. Add tomatoes, sugar and water; season. Simmer, uncovered, for about 5 minutes or until thickened. Taste, add more salt if needed.

Step 3

Spread mince mixture in the base of a 1.5 litre (6-cup) capacity ovenproof dish. Cool for a few minutes. Spread sour cream over top, then sprinkle with cheese. Crush chips into pieces about the size of cornflakes; sprinkle over top of pie. Bake for about 20 minutes or until cheese is melted and golden. Serve with lettuce, tomatoes and salsa.