Cajun turkey burgers

Name: Cajun turkey burgers
Ingredients: 3 tomatoes, deseeded and chopped; 195 g tin sweetcorn, drained; 400 g (14oz) tin black beans, drained and rinsed; small bunch coriander, roughly chopped; finely grated zest and juice 2 limes; 500 g (1lb 2oz) pack turkey mince; 75 g (3oz) millet flakes; 1 tsp. ground cumin; 1 tsp. ground coriander; 1 tsp. smoked paprika; 1/2 tsp dried oregano; 1 tbsp. olive oil; 2 avocadoes, peeled, stoned and sliced; juice 1/2 lime; 4 wholemeal burger buns or rolls