Step 1

Preheat oven to 200C/180C fan forced. Line a large baking tray with baking paper. Place sweet potato on prepared tray. Lightly spray with olive oil and sprinkle with ground cumin and coriander. Roast for 25-30 minutes or until tender. Place in a bowl. Coarsely mash. Cool.

Step 2

Add lentils, fresh coriander and breadcrumbs to the sweet potato mixture. Stir until well combined. Season. Shape mixture into eight 2cm-thick patties.

Step 3

Heat the oil in a large non-stick frying pan over medium-high heat. Cook patties, in batches, for 2-3 minutes each side or until golden. Divide tzatzki among plates. Top with rocket, tomato and patties.