1.Combine kumara, parsnip, chilli, onion and half the coriander in a large bowl. Whisk flour, cumin, egg and milk; stir until smooth. Add batter to kumara mixture; stir until well combined. Season with salt and pepper.
2.Heat oil in a large non-stick frying pan over moderately high heat. For each fritter, spoon 1/4 cup mixture into pan. Cook, 3 fritters at a time, tor 2-3 minutes each side or until golden and cooked. Drain on paper towels.
3.Whisk yogurt, remaining coriander and juice in a small bowl. Serve fritters with coriander yogurt and lemon wedges.