1. Put the first five ingredients and plenty of seasoning into a food processor and pulse until combined but still with a chunky texture. Empty into a large bowl and stir through the eggs and breadcrumbs. Form into four patties.
2. Heat oil in a large non-stick frying pan; gently fry the patties for 8 to 10 minutes, carefully turning once, until golden and piping hot.
3. Serve the burgers on buns, topped with avocado slices, a small dollop of sour cream and some tomato salsa.

Each serving 2 336kJ, 18g fat (4g saturated), 80g carbohydrate (11g total sugars).